vo's exam 3 - PRINTABLE VERSION Test 3 You scored 88 out of...

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PRINTABLE VERSION Test 3 You scored 88 out of 100 Question 1 Your answer is CORRECT. Are chambers which pump blood out into the arteries: a) arteries b) veins c) septum d) atria e) ventricles Question 2 Your answer is CORRECT. If blood pressure doubled at the same time that the peripheral resistance doubled, the blood flow through a vessel would be a) doubled. b) halved. c) 16 times greater. d) 1/16 as much. e) unchanged. Question 3 Your answer is CORRECT. Vascular resistance is related to the: a) length of a blood vessel. b) diameter of a blood vessel. c) nature of the blood flow. d) viscosity of the blood. e) all of these answers. Question 4 Your answer is CORRECT. Blood returning from the lungs: a) enters the right atrium. b) enters the left atrium
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c) is poorly oxygenated. d) both [a] and [c] above e) both [b] and [c] above Question 5 Your answer is CORRECT. Through which valve would blood travel to enter the pulmonary circuit of the circulatory system? a) aortic valve b) mitral valve c) pulmonary valve d) tricuspid valve Question 6 Your answer is CORRECT. The flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of increasing Ca 2+ __________ and decreasing K + __________. a) influx, efflux b) efflux, influx c) influx, influx d) efflux, efflux Question 7 Your answer is CORRECT. Why can't tetany of the heart occur? a) There are no distinct motor units in the heart. b) There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. c) The refractory period in cardiac muscle lasts almost as long as the duration of the resultant contraction. d) The heart contracts with maximal force every beat so it is impossible to increase the strength of cardiac contraction. e) Vagal stimulation slows down the heart rate to prevent summation of contractions. Question 8 Your answer is CORRECT. Which of the following is not true regarding the heart:
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a) To prevent their eversion during ventricular contraction, the aortic and pulmonary valves are connected to the ventricular walls by the chordae tendineae and papillary muscle. b) The heart requires its own circulatory circuit to obtain oxygen and nutrients from the blood because it can not obtain them from the blood being pumped in the chambers c) The left ventricular wall possesses more muscle (and is thicker) than the right ventricular wall. d) There are no valves lying between the atria and the veins. e) None of these answers Question 9 Your answer is CORRECT. The direction of the impulse through the conduction system of the heart for each cardiac cycle is normally: a) AV node → SA node → bundle of His → Purkinje fibers b) AV node → bundle of His → SA node → Purkinje fibers c) bundle of His → AV node → Purkinje fibers → SA node d) SA node → AV node → bundle of His → Purkinje fibers e) SA node → bundle of His → Purkinje fibers → AV node Question 10 Your answer is CORRECT. Which of the following ECG waves represents ventricular depolarization?
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vo's exam 3 - PRINTABLE VERSION Test 3 You scored 88 out of...

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