Last Modified: December, 2009. (J. Crimando)
Practice Quiz #6
1. Sympathetic stimulation to the heart’s natural pacemaker normally results in:
a. a faster heart rate b. a greater force of myocardial contraction
c. both choices (a) and (b) are correct
d. the heart’s natural pacemaker is not influenced by sympathetic stimulation
1. The normal heart sounds (lub and dup) are produced by which of the following events?
a. sympathetic stimulation of the sinoatrial node
b. closure of the atrioventricular and semilunar valves c. friction of blood flowing against the chamber walls
d. ventricular systole
3. Following a motor vehicle accident, a large loss of blood will initially cause:
a. a lowered BP due to a decreased cardiac output b. a higher BP due to an increased stroke volume
c. no change in BP but a slower heart rate
d. no change in BP but an increased respiration rate
4. The left ventricle’s myocardium is thicker than the right ventricle’s myocardium in order to:
a. accommodate a greater volume of blood
b. increase the size of the thoracic cavity during diastole
c. contract with a greater pressure d. force blood through a smaller semilunar valve
5. The pain associated with decreased blood delivery to the heart’s tissues, possibly caused by a transient spasm of coronary arteries, is termed:
a. ischemia
b. myocardial infarction
c. pericarditis
d. angina pectoris
6. A thrombus in the first branch off the aortic arch would affect the flow of blood to the:
a. left side of the head and neck, and left upper arm
b. myocardium
c. left upper arm
d. right side of the head and neck, and right upper arm
7. At the Battle of Shiloh during the American Civil War, Confederate General Albert Johnston was killed when he was shot in the back of the knee and rapidly bled to death. Which blood vessel was most likely to have been injured?
a. femoral artery
b. common iliac artery
c. anterior tibialis artery
d. popliteal artery
8. Which of the following is NOT generally considered part of the Circle of Willis?
a. anterior cerebral artery
b. posterior cerebral artery
c. anterior communicating artery
d. posterior communicating artery
e. vertebral artery
9. The longest superficial vein in the body is the:
a. right brachial vein
b. left radial vein
c. superior vena cava
d. great saphenous vein e. anterior tibialis vein
10. An external iliac artery empties into the:
a. common iliac artery
b. internal iliac artery
c. abdominal aorta
d. femoral artery e. renal artery
