1. Blood may flow in the aorta with a
speed of 30cm/s and in the capillaries with a speed of only 0.1m/s.
Why is there such a large difference in speed?
A. The capillaries are much further from
the heart than the aorta.
B. The very narrow capillaries present a
large resistance to blood flow compared to the large diameter aorta.
C. The total cross-sectional area of the
lumens of the capillaries is much greater than the cross-sectional area of the
aorta.
D. The length of the aorta is short
compared to the length of a capillary.
2. Which statement about cardiac
1. Blood may flow in the aorta with a
speed of 30cm/s and in the capillaries with a speed of only 0.1m/s.
Why is there such a large difference in speed?
A. The capillaries are much further from
the heart than the aorta.
B. The very narrow capillaries present a
large resistance to blood flow compared to the large diameter aorta.
C. The total cross-sectional area of the
lumens of the capillaries is much greater than the cross-sectional area of the
aorta.
D. The length of the aorta is short
compared to the length of a capillary.
2. Which statement about cardiac output
is correct? Cardiac output is:
A. The sum of volume of blood pumped by
left and right ventricles per minute
B. The mean arterial pressure divided by
total peripheral resistance
C. The mean arterial pressure multiplied
by stroke volume
D. The blood volume multiplied by heart
rate
3. In which of the following situations
would blood pressure be increased?
A. Antidiuretic hormone (ADH) secretion
is inhibited.
B. The kidneys absorb less water before
it is excreted as urine.
C. The extracellular fluid volume
decreases.
D. The extracellular fluid volume
increases.
4. In the circulatory system, why does
an increase in cardiac output cause an increase in volume flow rate (of blood)?
Because:
A. An increased cardiac output causes
vasoconstriction.
B. As cardiac output increases, so blood
viscosity increases.
C. As cardiac output increases, the
resistance of the systemic circulation to blood flow decreases.
D. Cardiac output and volume flow rate
are the same thing
5. The Korotkoff sounds that are
listened for during a blood pressure measurement by the auscultatory method are
caused by:
A. Turbulent blood flow in the aorta
B. The difference between systolic
pressure and cuff pressure
C. Turbulent flow in the collapsed
brachial artery
D. The opening and closing of the heart
valves
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