Visceral smooth muscle
A. may contain groups of cells that function as an independent unit.
B. occurs in sheets and exhibits numerous gap junctions.
C. contracts only when stimulated.
D. does not function as a unit.
E. All of these choices are correct.
B
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A) Pulmonary arterial resistance is high. B) Pulmonary vessels are collapsed. C) Rib cage is compressed. D) Alveoli are expanded. E) Lungs and airways contain only a small amount of fluid.
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The enzyme that coverts fibrinogen to fibrin is __________.
a) tissue factor b) thrombin c) prothrombin d) factor Xa
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