NS3410-2012-quiz 7-KEY

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Mechanical Engineering

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Oct 30, 2023

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NS3410 Spring 2012 Quiz 7 04/04/12 EMAIL:______________________NAME:_____________________ Circle the correct answer or fill in the blank with the appropriate term (1 pt each). 1. Match the term to the description (0.2 pts each) 5____Sinoatrial (SA) node 1. From repolarization of the ventricles 2____Atrioventricular (Av) bundle 2. Propagates AP from atria to the ventricles 4____Purkinjie fibers 3. From depolarization of the atria 3____P wave 4. Run up the external ventricle walls 1____T wave 5. Serves as “Pacemaker” of the heart 2. All of the following applies to autorhythmic cells EXCEPT : They comprise 1% of cardiac cells They contain a lower number of contractile fibers They are found in all areas of the cardiac muscle They display an unstable membrane resting potential They contain I f or “funny channels” 3. Circle the characteristic on each row that describes cardiac muscle (0.2 pt each): Nonstriated / striated Under voluntary / involuntary control Requires extracellular Ca2+ to contract yes / no Gap junctions are present / absent T-tubules are present / absent 4. The myocardium receives its blood supply from the coronary arteries. True/False 5. The left ventricular wall of the heart is thicker than the right wall in order to accommodate a greater volume of blood. True/False
6. The three circuits of blood are the ________________ circuit, _________________ circuit and __________________ circuit. Pulmonary, cardiac and systemic 7. The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur. True/False 8. The ______________ and _________________ valves of the heart have no chordae tendineae attached. aortic; pulmonary. Semilunar gets 0.5 pt 9. Blood IN the right atrium travels through which of the following valves /structures / chambers during a typical heart beat start at 1; 7____Bicuspid 3____Pulmonary artery 2____Right ventricle 1____Tricuspid 5____Pulmonary veins 6_____Left atrium 10____Aorta 8_____Left ventricle 4_____Lung 9_____Aortic valve 10. The ____________________ is a visceral membrane covering the heart immediately outside of the heart muscle. Epicardium (pericardium gets 0.5 point)
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