CHAPTER 7 • ORGAN BLOOD FLOW
177
3.
W hich one of the following organ
circulations is most strongly constricted
during sympathetic activation resulting
from a baroreceptor reflex when a person
suddenly stands up?
a. Brain
b. Heart
c. Intestine
d. Skin
Match the organs listed in questions 4 to 9
with answers “a” through “i” below. Each
question may have more than one correct
answer.
a. Blood flow is primarily regulated by
CO2 and H+.
b. Capillary beds found between two
in-series arterioles
c. Hypoxic vasoconstriction
d. Highest capillary pressure
e. Highest arterial-venous oxygen
difference
f.
Abundant arterial-venous anastomoses
g. Largest organ mass
h. Receives most of its blood supply
directly from other organs
i.
Controlled primarily by hypothalamic
thermoregulatory centers
4.
Skin circulation_____
5.
Renal circulation_____
6.
Coronary arteries_____
7.
Pulmonary circulation_____
8.
Cerebral circulation_____
9.
Skeletal muscle circulation_____
10. A hypertensive patient is diagnosed
with bilateral renal artery stenosis. You
consider administering an ACE inhibi-
tor to lower the blood pressure. By what
mechanism might this drug adversely
affect renal glomerular filtration?
a. Constriction of afferent arterioles
b. Constriction of efferent arterioles
c. Dilation of afferent arterioles
d. Dilation of efferent arterioles
11. A patient with anginal symptoms is
diagnosed with coronary artery disease
and coronary vasospasm. W hich of
the following might be responsible for
increased susceptibility to vasospasm?
a. Diminished endothelial production of
nitric oxide
b. Diminished sympathetic tone on the
coronary vessels
c. Ischemia-induced production of aden-
osine
d. Reduced coronary endothelial pro-
duction of endothelin-1
12. Intracranial pressure is steadily increas-
ing in a patient who has recently suffered
a hemorrhagic stroke. You are concerned
about this finding because elevated
intracranial pressure can result in
a. Decreased blood flow.
b. Decreased cerebral vascular
resistance.
c. Increased cerebral perfusion pressure.
d. Increased cerebral vascular
transmural pressure.
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