171. Which of the following lists the elements of the hearts conduction system i

Question

171. Which of the following lists the elements of the hearts conduction system in the correct order? a. SA bundle, . AV node, SA node, AV bundle, bundle branches, conduction myo node, conduction myofibers C. SA node, AV node, AV bundle, bundle branches, conduction myohbs d. conduction myofibers, AV bundle, bundle branches, AV node, SA node e. SA node, AV bundle, AV node, bundle branches, conduction myoiber 172. ALL of the following are TRUE regarding the ventricles EXCEPT: a the left ventricle pumps blood the pulmonary circulation to the systemic circulation and the right ventricle pumps blood to b. the wall of the left ventricle is thicker than that of the right ventricle. c. walls of both ventricles have trabeculae carneae and papillary muscles. d. the left ventricle expels a greater volume of blood per beat than does the right ventricle. 173. If heart rate increases to very high levels, then: e a. the autonomic nervous system will release more epinephrine to the SA node to s tabilize the heart rate. b. stroke volume increases to keep cardiac output constant. c. the oxygen content of blood falls to levels insufficient to maintain cardiac activity. d. end-diastolic volume drops because ventricular filling time is so short. e. end-systolic volume increases because the valves are open for only a short time. 174. An increase in venous return most directly affects: a. blood pressure. b. systemic vascular resistance. c. stroke volume. d. blood viscosity. e. heart rate. 175. Hypertension can decrease cardiac output by significantly increasing the afterload ; this me the a. end-systolic volume. b. end-diastolic volume. c. pressure that must be overcome before semilunar valves can open. d. pressure in blood vessels necessary to cause the semilunar valves to close. e. maximum possible cardiac output above resting cardiac output. 176. The second heart sound (dupp) is created by the: a. closing of the atrioventricular valves. b. opening of the atrioventricular valves. c. closing of the semilunar valves. d. opening of the semilunar valves. e. vibration of the chordae tendineae during ventricular systole

Explanation / Answer

171. The elements of heat conduction system:

(c) SA node, AV node, AV bundle, bundle branches, conduction myofibers.

172. (d) the left ventricle expels a great volume of blood per beat than does the right ventricle.

173. If heart rate increases to very high levels then:

(c) the oxygen content of blood falls to levels insufficient to maintain cardiac activity.

174. An increase in venous returns most directly affects:

(d) blood viscosity.

Decrease in systemic blood pressure because of increase fluid loss from the kidneys. Increase in venous return because high amount of water is reabsorbed into the blood from the kidneys to increase the blood volume.

175. Hypertension can decrease cardiac output by significantly increasing the afterload this means:

(d) pressure in blood vessels necessary to cause the semilunar valves to close.

176. The second heart sound ( dupp) is created by the:

(c) closing of semilunar valves.

The second heart sound (S2) is shorter and higher pitched than the (S1) it is heard as dupp and produced by the closure of the aortic and pulmonary valves (semilunar valves).

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