Varicose veins seen in the superficial veins of the legs are unsightly and often treated by surgically removing them. However, even without these veins being present, the return of all blood toward the heart from the legs is not diminished primarily because ____
A) the precapillary sphincters will contract to prevent blood from flowing toward areas where veins have been removed
B) blood can still return via the deep veins
C) in the absence of the venous valves (that have been removed), the blood will backflow into the capillary beds and then flow into other venules
D) All of the listed responses are correct.
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All capillary beds are continuously perfused with blood.
True
False
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Leaky capillaries found in the bone marrow are called
A) arterioles
B) continuous capillaries
C) fenestrated capillaries
D) sinusoidal capillaries
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Which capillaries are the most common in the body
A) sinusoids
B) anastomoses
C) fenestrated capillaries
D) continuous capillaries
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