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Multiple Choice



1

Back flow from the arteries into the ventricles is prevented by the
A)atrioventricular valves.
B)tricuspid valves.
C)semilunar valves.
D)bicuspid valves.
2

Oxygenated blood returns to the heart via the
A)pulmonary artery.
B)pulmonary vein.
C)superior vena cava.
D)aorta.
3

At rest, contraction of the ventricles ejects
A)about one third of the blood.
B)about two thirds of the blood.
C)about half of the blood.
D)none of the above.
4

Increases in heart rate during exercise are achieved primarily through
A)an increase in the time spent in diastole.
B)an increase in the time spent in systole.
C)an decrease in the time spent in systole.
D)an decrease in the time spent in diastole.
5

The P wave of an ECG results from
A)atrial depolarization.
B)atrial repolarization.
C)ventricular repolarization.
D)ventricular depolarization.
6

Cardiac output can be increased with a rise in
A)heart rate.
B)stroke volume.
C)ST segment of the ECG.
D)both a and b.
7

The major influence on end diastolic volume is
A)strength of ventricular contraction.
B)lengthening of cardiac fibers.
C)venous return.
D)afterload.
8

The determinant/s of heart rate is/are
A)the parasympathetic nervous system.
B)the sympathetic nervous system.
C)cardiac output.
D)both a and b.
9

The average hematocrit of a normal male is approximately
A)42%.
B)97%.
C)49%.
D)21%.
10

The a-v O2 difference represents
A)cardiac output.
B)stroke volume.
C)O2 uptake by the tissues.
D)both a and b.
11

During maximal exercise _____% of total cardiac output is directed to contracting skeletal muscle
A)15 to 20
B)100
C)60 to 65
D)80 to 85
12

During exercise, vascular resistance to visceral organs increases due to
A)increased adrenergic sympathetic output.
B)decreased adrenergic sympathetic output.
C)increased parasympathetic activity.
D)none of the above.
13

Cardiovascular drift is due to
A)decrease in heart rate.
B)increase in stroke volume.
C)cutaneous vasoconstriction.
D)none of the above.
14

The initial signal to the cardiovascular system at the onset of exercise comes from
A)baroreceptors.
B)chemoreceptors.
C)higher brain centers.
D)all of the above.
15

Baroreceptors are sensitive to changes in
A)muscle metabolites.
B)muscle pressure.
C)arterial pressure.
D)none of the above.
16

The increased metabolic demand placed on the heart during exercise can be best estimated by examining the
A)double product.
B)systolic blood pressure.
C)diastolic blood pressure.
D)heart rate.
17

Oxygen delivery to exercising skeletal muscle increases due to
A)decreased cardiac output.
B)redistribution of blood flow to inactive organs.
C)decrease in arterial blood pressure.
D)none of the above.
18

The release of nitric oxide promotes
A)smooth muscle relaxation.
B)vasodilation.
C)increased blood flow.
D)all of the above.
19

Endurance athletes have improved ventricular filling due to
A)decreased heart rate.
B)increased venous return.
C)decreased venous return.
D)decreased stroke volume.





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