The structure of a capillary wall differs from that of a vein or artery because
A. capillaries are impermeable to all substances.
B. capillaries can constrict or dilate.
C. capillary walls have only endothelium and a basement membrane.
D. the capillary wall has only two tunics.
E. capillaries have more smooth muscle.
Answer: C
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The force that moves fluid out of capillaries is ________ pressure whereas the opposing force that moves fluid into capillaries is ________ pressure
A) systolic; diastolic B) hydrostatic; colloid osmotic C) blood; interstitial D) colloid osmotic; hydrostatic E) plasma; extracellular
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Which of these happens first in an cholinergic synaptic transmission?
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