49. The heart sounds are due to the A. valves closing. B.heart contraction. C. h

Question

49. The heart sounds are due to the A. valves closing. B.heart contraction. C. heart relaxing. D. blood flowing. 50. The first heart sound "lub" is made by A. closure of the AV valves. B. closure of the semilunar valves. C. contraction of the ventricles. D. contraction of the atria. 51. The sound of a heart murmur is created from A. acid reflux in the esophagus. B. fluid in the lungs. C. leaky heart valves. D. a hiccup. 52. How is the heart muscle nourished? A. by blood in the left ventricle B. by the coronary arteries C. by the cardiac vein D. by the carotid artery 53. What initiates the heartbeat and is called the pacemaker? A. nerves B. AV node C. SA node

Explanation / Answer

Answer

49) A valves closing

50) A closure of AV valves

51) C leaky heart valves

52) B by the coronary arteries

53) C SA node

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