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class="page_title"> Topic 6 Human Physiology Paper 1 questions <a href="#" class="mark-page-favorite pull-right" data-pid="2886" title="Mark as favorite" onclick="return false;"><i class="fa fa-star-o"></i></a> </h1> <ol class="breadcrumb"> <li><a href="../../../biology.html"><i class="fa fa-home"></i></a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><a href="../2876/paper-1-style-exam-questions.html">Paper 1 style Exam questions</a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><span class="gray">Topic 6 Human Physiology Paper 1 questions</span></li> <span class="pull-right" style="color: #555" title="Suggested study time: 30 minutes"><i class="fa fa-clock-o"></i> 30'</span> </ol> <article id="main-article"> <h3><span class="mw-headline" id="Topic_1:_Cell_biology">Topic 6: <a class="internal-link" href="https://e.studyib.net/biology/page/468/06-human-physiology">Human physiology</a></span> <img alt="" src="../../images/06_humans/heart_100x100-1.png" style="float: right; height: 102px; width: 100px;"></h3> <p><span class="mw-headline">This page contains <strong>multiple choice questions</strong> in the style of Paper 1 of the Biology exams.<br> They test the breadth of your knowledge of the understandings and skills<strong> about Human Physiology</strong>.</span><span class="mw-headline"><br> To spend more time reviewing the topic before answering these questions, use the revision resources.</span></p> <div class="index-list"> <div class="item"> <div class="bg-cover cover-96" onclick="window.location='/biology/page/468/06-human-physiology'" style="background-image: url('../../images/06_humans/gland_square_image-1.jpg')" title="06 Human physiology"> </div> <div class="content"> <h4 class="head"><a href="../468/06-human-physiology.html">Human physiology revision resources</a></h4> <p class="body">This is an introduction to the human physiology topic. It lists understandings and skills expected for Topic 6 including digestion, heart and circulation, immune system, lungs and gas exchange, the nervous system, hormones and reproduction....</p> </div> </div> </div> <p><span class="mw-headline">Learn from any mistakes. Every question has an examiner's explanation that appears when you check your answers.<span class="mw-headline"><span class="mw-headline"><span class="mw-headline"><img alt="" src="../../images/00_random-images/check-button.png" style="width: 80px; height: 35px;"></span></span></span></span></p> <div class="tib-quiz dyn-quiz" data-pid="2886" data-mtime="1675505941.8419"><div class="label label-default q-number">1</div><div class="exercise shadow-bottom"><div class="q-question"><p>What is the advantage of villi and microvilli increasing the surface area of epithelium in the small intestines?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> The rate of digestion increases.</label></p><p><label class="radio"><input class="c" type="radio"> The rate of absorption of digested nutrients increases.</label></p><p><label class="radio"><input type="radio"> The speed of movement of partly digestest 'chyme' increases.</label></p><p><label class="radio"><input type="radio"> The epithelial cells make a stronger lining for the intestines.</label></p></div><div class="q-explanation"><p>The larger the surface area of epithelium the faster the rate of absorption is..</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">2</div><div class="exercise shadow-bottom"><div class="q-question"><p>What is the fate of cellulose in the human digestive system?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Cellulose is digested by the enzyme cellulase produced in the pancreas.</label></p><p><label class="radio"><input class="c" type="radio"> Cellulose is not digested by human enzymes but some may be digested by bacteria.</label></p><p><label class="radio"><input type="radio"> Cellulose is digested in the stomach, by gastric juice.</label></p><p><label class="radio"><input type="radio"> Cellulose is emulsified by bile, but then is left undigested as 'fibre'.</label></p></div><div class="q-explanation"><p>Humans don't make enzymes to digest cellulose. Bacteria can digest cellulose in the human intestines, but much of the cellulose eaten is undigested. It is sometimes called 'Fibre'.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">3</div><div class="exercise shadow-bottom"><div class="q-question"><p>If the skin is broken then a blood clot forms to seal this cut.</p><p>What is the role of fibrinogen in the process of blood clotting?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Fibrin turns into fibrinogen.</label></p><p><label class="radio"><input class="c" type="radio"> Fibrinogen is converted to fibrin.</label></p><p><label class="radio"><input type="radio"> Fibrinogen is converted into thrombin</label></p><p><label class="radio"><input type="radio"> Fibrinogen is converted into prothrombin</label></p></div><div class="q-explanation"><p>Platelets release clotting factors. first in the process of blood clotting.</p><p>There is a cascade of reactions in which fibrinogen is converted into fibrin.</p><p>Blood clotting seals cuts in the skin. (skin diagrams are not required.)</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">4</div><div class="exercise shadow-bottom"><div class="q-question"><p>When activated some lymphocytes produce antibodies and other lymphocytes act as memory cells.<br><br><img alt="" src="../../images/06_humans/lymphocytes_memorycells.png" style="width: 250px; height: 140px;"></p><p>Which of the following best describes the role of memory cells?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> They store antigens from the pathogen for lymphocytes to use as a template for antibodies in the future.</label></p><p><label class="radio"><input type="radio"> They remember the antigen on the pathogen and tell the lymphocytes how to respond if it is re-encountered.</label></p><p><label class="radio"><input type="radio"> They quickly clone to form a group of phagocytes if the pathogen is re-encountered.</label></p><p><label class="radio"><input class="c" type="radio"> They quickly clone to form a group of plasma cells if the pathogen is re-encountered.</label></p></div><div class="q-explanation"><p>Some lymphocytes act as memory cells and can quickly reproduce to form a clone of plasma cells if a pathogen carrying a specific antigen is encountered again.<br>Note: Subgroups of phagocyte and lymphocyte are not required, except these two types of cells derived from lymphocytes.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">5</div><div class="exercise shadow-bottom"><div class="q-question"><p>Florey and Chain shared a Nobel Prize with Alexander Fleming for their work on penicilin.</p><p>Which of the following statements best describes their experiment which tested penecillin on mice?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Four mice injected with a bacterial disease and four injected with penicillin.</label></p><p><label class="radio"><input type="radio"> Two mice injected with penicillin and a bacterial disease.</label></p><p><label class="radio"><input class="c" type="radio"> Eight mice were injected with a lethal dose of disease bacteria, four of which were also given penicillin.</label></p><p><label class="radio"><input type="radio"> Hundreds of mice injected with penicillin and their lives monitored to measure how many of the mice developed infections.</label></p></div><div class="q-explanation"><p><u><strong>Describe Florey and Chain’s experiments to test penicillin on bacterial infections in mice.</strong></u></p><p>In March 1940 Chain requested that two mice be injected with a sample of the penicillin.<br>The mice survived showing that penicillin was not toxic to mice. <br><br>Florey then tested the antibacterial properties of penicillin in mice.<br>Eight mice were injected with hemolytic streptococci (bacteria)</p><p>Four of these were subsequently injected with doses of penicillin. Four were untreated.<br><br>Less than one day later the four mice that had received penicillin were alive, but the untreated mice were dead.</p><p>Further testing involving hundreds of mice was carried out<br>On August 24, 1940, Florey and Chain reported their findings in the Lancet; as a cure for bacterial disease.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">6</div><div class="exercise shadow-bottom"><div class="q-question"><p>How do nerve impulses travel in the nervous system?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Chemicals move with the blood.</label></p><p><label class="radio"><input class="c" type="radio"> Electrical impulses move in neurones.</label></p><p><label class="radio"><input type="radio"> Ions diffuse along neurones.</label></p><p><label class="radio"><input type="radio"> Neurotransmitters diffuse along neurones.</label></p></div><div class="q-explanation"><p>Although neurones release chemical neurotransmitters at their endings they actually transmit electrical impulses along their length. This is caused by movement of charged ions across the membrane, but these ions don't move along the neurone.</p></div><div class="remove-section" style="display: none;" title="Remove question field"> </div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">7</div><div class="exercise shadow-bottom"><div class="q-question"><p><img alt="" src="../../images/06_humans/synapse_simple.jpg" style="width: 200px; height: 112px; float: right;">The diagram shows parts of two neurones at a synapse.</p><p>The red dots show a neurotransmitter being released into the synaptic cleft. </p><p>Which of the statements below best describes what usually happens to the neurotransmitter molecules after their release?</p><hr class="hidden"></div><div class="q-answer"><p><label class="radio"><input type="radio"> They are reabsorbed into vesicles.</label></p><p><label class="radio"><input type="radio"> They are broken down by enzymes.</label></p><p><label class="radio"><input type="radio"> They are absorbed into the post-synaptic neurone.</label></p><p><label class="radio"><input class="c" type="radio"> They bind to receptors in the post-synaptic neurone.</label></p></div><div class="q-explanation"><p>Neurotransmitters diffuse across the synaptic cleft and bind to receptors in post synaptic neurones.</p><p>After this they can be broken down by enzymes before reabsorption by the presynaptic neurone.</p></div><div class="remove-section" style="display: none;" title="Remove question field"> </div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">8</div><div class="exercise shadow-bottom"><div class="q-question"><p>What are the main functions of the intestines of the human?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Digestion, secretion, storage.</label></p><p><label class="radio"><input type="radio"> Digestion, sensitivity, absorption.</label></p><p><label class="radio"><input type="radio"> Digestion, homeostasis, excretion.</label></p><p><label class="radio"><input class="c" type="radio"> Digestion, peristalsis, absorption.</label></p></div><div class="q-explanation"><p>The digestive system moves ingested nutrients by peristalsis, secretes some enzymes and much mucus, digests macromolecules and absorbs nutrients.<br>While excretion of some chemicals does pass by the digestive system, this is not its main function. Sensitivity is not an important function, nor is storage.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">9</div><div class="exercise shadow-bottom"><div class="q-question"><p>Which of the following is achieved by peristalsis?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Moving the partly digested food along the intestine and producing enzymes.</label></p><p><label class="radio"><input type="radio"> Mixing partly digested food with enzymes and producing bile.</label></p><p><label class="radio"><input type="radio"> Mixing of partly digested food with enzymes and <span class="scayt-misspell-word" data-scayt-word="egestion" data-wsc-id="ky8yyrdehtkz8jq57" data-wsc-lang="en_GB">egestion</span></label>.</p><p><label class="radio"><input class="c" type="radio"> Moving the food along the intestine and mixing it with enzymes.</label></p></div><div class="q-explanation"><p>Peristaltic movements cause mixing of the food contents with enzymes and move the digesting food slowly through the intestines.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">10</div><div class="exercise shadow-bottom"><div class="q-question"><p>Why could the liver considered to be an organ of the digestive system?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> It produces enzymes.</label></p><p><label class="radio"><input type="radio"> It secretes acid into the stomach.</label></p><p><label class="radio"><input type="radio"> It stores glucose as glycogen..</label></p><p><label class="radio"><input class="c" type="radio"> It produces bile which helps in the digestion of lipids.</label></p></div><div class="q-explanation"><p>The blood leaving the small intestine is transported to the liver where digested nutrients such as glucose can be stored as glycogen, but a more important role of the liver in <strong>digestion</strong> is the production of bile, which is secreted to emulsify lipids to aid their digestion.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">11</div><div class="exercise shadow-bottom"><div class="q-question"><p>Which of the following are absorbed by villi?</p><p style="margin-left: 40px;">I Haemoglobin molecules</p><p style="margin-left: 40px;">II Vitamin C</p><p style="margin-left: 40px;">III Minerals</p><p style="margin-left: 40px;">IV Amino acids</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> IV only</label></p><p><label class="radio"><input type="radio"> II, III only</label></p><p><label class="radio"><input type="radio"> I, IV only</label></p><p><label class="radio"><input class="c" type="radio"> II, III, IV only</label></p></div><div class="q-explanation"><p>Villi absorb monomer products of digestion and small soluble molecules such as vitamins and minerals.<br>Proteins larger than a few peptides long need to be hydrolysed before they can be absorbed.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">12</div><div class="exercise shadow-bottom"><div class="q-question"><p>Which process best describes the action of digestive enzymes on polymers?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Depolymerisation</label></p><p><label class="radio"><input type="radio"> Monomerisation</label></p><p><label class="radio"><input type="radio"> Condensation</label></p><p><label class="radio"><input class="c" type="radio"> Hydrolysis</label></p></div><div class="q-explanation"><p>Digestive enzymes break the bonds in polymers by adding water - hydrolysis.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">13</div><div class="exercise shadow-bottom"><div class="q-question"><p>Which statement correctly describes an artery?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> The blood flow direction is towards the heart.</label></p><p><label class="radio"><input class="c" type="radio"> The blood flow direction is away from the heart</label></p><p><label class="radio"><input type="radio"> The muscular walls are thicker than the inner epithelial layer.</label></p><p><label class="radio"><input type="radio"> It carries oxygenated blood.</label></p></div><div class="q-explanation"><p>Arteries are defined by the direction of flow from the heart, they do have muscular walls but so do veins (even though they are thinner), the pulmonary artery carries deoxygenated blood</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">14</div><div class="exercise shadow-bottom"><div class="q-question"><p>What is the role of muscle fibres and elastic fibres in the walls of arteries?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> To increase the maximum blood pressure when the ventricles contract.</label></p><p><label class="radio"><input type="radio"> To reduce the blood pressure between contractions of the ventricles.</label></p><p><label class="radio"><input class="c" type="radio"> To maintain blood pressure between contractions of the ventricles.</label></p><p><label class="radio"><input type="radio"> To prevent the blood from flowing back into the ventricle of the heart.</label></p></div><div class="q-explanation"><p>The elastic walls of the arteries expand and then contract between contractions of the ventricles, this movement maintains blood pressure between pump cycles.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">15</div><div class="exercise shadow-bottom"><div class="q-question"><p>Which of the following is the main contribution of epidemiological studies to our knowledge of disease?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> They kill the pathogens which cause disease.</label></p><p><label class="radio"><input type="radio"> They discover new drugs to treat diseases.</label></p><p><label class="radio"><input type="radio"> They experiment on humans to be able to find cures for diseases.</label></p><p><label class="radio"><input class="c" type="radio"> They study the causes and consequences of diseases like cancer.</label></p></div><div class="q-explanation"><p>Epidemiologists study disease to examine causes and consequences which may lead to preventative measures</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">16</div><div class="exercise shadow-bottom"><div class="q-question"><p>Why is the rib cage moved upwards and outwards during deep inspiration?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> To increase air pressure in the lungs.</label></p><p><label class="radio"><input type="radio"> To decrease the volume of the lungs.</label></p><p><label class="radio"><input type="radio"> To cause the diaphragm to move further.</label></p><p><label class="radio"><input class="c" type="radio"> To increase the thorax volume.</label></p></div><div class="q-explanation"><p>The raising of the rib cage increases thoracic volume, decreasing pressure, causing air to enter because the pressure in the thorax is lower than atmospheric pressure.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">17</div><div class="exercise shadow-bottom"><div class="q-question"><p>The axon of a motor neuron in vertebrates is surrounded by a myelin sheath. How does the myelin sheath affect the transmission of an action potential?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Increases the frequency of the action potentials.</label></p><p><label class="radio"><input type="radio"> Increases the rate of depolarisation in the membrane.</label></p><p><label class="radio"><input type="radio"> Increases the size of the action potential.</label></p><p><label class="radio"><input class="c" type="radio"> Increases the rate of movement down the axon by saltatory conduction.</label></p></div><div class="q-explanation"><p>Nodes of Ranvier are found between successive Schwann cells in the myelin sheath. The impulse "jumps" from one node to the next, increasing the speed of transmission.</p></div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">18</div><div class="exercise shadow-bottom"><div class="q-question"><p><span style="color: rgb(0, 0, 0); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">Why is the somatic (body) circulation separate from the pulmonary (lung) circulation?</span></p></div><div class="q-answer"><p><label class="radio"><input type="radio"> <span style="color: rgb(0, 0, 0); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">Pressure and flow rates are equal in both but the blood in each side of the heart must not mix</span></label>.</p><p><label class="radio"><input type="radio"> <span style="color: rgb(0, 0, 0); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">The somatic circulation requires a slower flow rate and a higher pressure than the pulmonary circulation. </span></label> </p><p><label class="radio"><input type="radio"> <span style="color: rgb(0, 0, 0); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">The somatic circulation requires a faster flow rate and a lower pressure than the pulmonary circulation</span></label>.</p><p><label class="radio"><input class="c" type="radio"> <span style="color: rgb(0, 0, 0); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">The somatic circulation requires a faster flow rate and a higher pressure.than the pulmonary circulation.</span></label> </p></div><div class="q-explanation"><p><span style="color: rgb(0, 0, 0); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: pre-wrap; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">The right side of the heart generates a low pressure and slow flow rate to allow blood to become oxygenated and to not damage the lung alveoli.</span></p></div><div class="remove-section" style="display: none;" title="Remove question field"> </div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">19</div><div class="exercise shadow-bottom"><div class="q-question"><p>Where would the highest pressure be found in the heart?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Left atrium at systole.</label></p><p><label class="radio"><input type="radio"> Right ventricle at diastole.</label></p><p><label class="radio"><input type="radio"> Right atrium at systole.</label></p><p><label class="radio"><input class="c" type="radio"> Left ventricle at systole.</label></p></div><div class="q-explanation"><p>Systole is contraction of a heart chamber, the left ventricle has the highest pressure to pump blood around the systemic (body) circulation.</p></div><div class="remove-section" style="display: none;" title="Remove question field"> </div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="label label-default q-number">20</div><div class="exercise shadow-bottom"><div class="q-question"><p>Which major blood vessel does not have valves?</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> Vena cava.</label></p><p><label class="radio"><input type="radio"> Pulmonary artery.</label></p><p><label class="radio"><input class="c" type="radio"> Pulmonary vein.</label></p><p><label class="radio"><input type="radio"> Aorta.</label></p></div><div class="q-explanation"><p>The pulmonary vein does not need valves because it is short in length and the pressure of blood from the heart retains the flow. The aorta and pulmonary artery have veins to prevent backflow of blood to the heart. The vena cava is the main vein returning blood to the heart from the body and has valves.</p></div><div class="remove-section" style="display: none;" title="Remove question field"> </div><div class="actions"><span class="score" data-score="0"></span><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="totals"><span class="score"></span><button class="btn btn-success btn-block text-center check-total"><i class="fa fa-check-square-o"></i> Check</button></div></div><hr> <p>Refresh this page to try a new set of 20 multiple choice questions. The questions will be different next time you visit. 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