Chapter 15: Alterations in Blood Flow
Test Bank
MULTIPLE CHOICE
1. Which vessel normally demonstrates the most rapid blood flow?
a. An arteriole
b. A capillary
c. A venule
d. The vena cava
ANS: D
The vena cava h
...
Chapter 15: Alterations in Blood Flow
Test Bank
MULTIPLE CHOICE
1. Which vessel normally demonstrates the most rapid blood flow?
a. An arteriole
b. A capillary
c. A venule
d. The vena cava
ANS: D
The vena cava has the most rapid rate of flow. Arterioles don’t offer the
most rapid blood flow. Capillaries are composed of a single thickness of
endothelial cells attached to a protein network called the basement
membrane and don’t offer the most rapid blood flow. A venule begins
where the arteriole ends and doesn’t offer the most rapid blood flow.
REF: Pg. 316
2. The movement of blood through the vascular system is opposed by the
force of
a. viscosity.
b. the vessel length.
c. the vessel radius.
d. resistance.
ANS: D
The movement of blood through the vascular system is opposed by the
force of resistance. Three determinants of resistance are vessel length,
vessel radius, and blood viscosity. Viscosity is the thickness of fluid and
has an effect on resistance. The length of the vessel does have an
effect on the resistance. Vessel radius has an effect on resistance.
REF: Pg. 314
3. Which causes vasoconstriction?
a. Norepinephrine
b. Calcium channel blocker
c. -Adrenergic antagonist
d. Acetylcholine
ANS: A
The release of norepinephrine results in arterial vasoconstriction via
receptors located on the vascular smooth muscle walls. Calcium
channel blockers produce vasodilation by interfering with calcium
intake into the vascular smooth muscle cells. -Adrenergic antagonists
do not cause vasoconstriction. Acetylcholine does not have an effect
on vasoconstriction.
REF: Pg. 318
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