The Intrinsic Pathway:
1.does not rely on the action of thrombin.
2.is activated only after tissue damage.
3.is activated within seconds of vessel damage.
4.is slower than the extrinsic pathway.
4
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Smooth muscle tone is maintained by the prolonged presence of _____ in the muscle cell's cytosol?
a) ATP b) calcium ions c) phosphate ions d) myoglobin e) None of these choices.
What problem will occur in a newborn in whom the foramen ovale has failed to close?
A) Oxygenated and deoxygenated blood will be able to mix freely. B) The hepatic portal system will not be able to return blood to the vena cava. C) Blood will be able to flow freely between the two ventricles. D) This is not a problem; it is normally open until adulthood. E) None of the answers are correct.
Which of the following best describes the structure of lymphatic capillary walls?
A. Thin-walled, with tightly joined cuboidal cells B. Thin-walled, with overlapping squamous cells C. Thick-walled, with tightly joined squamous cells D. Thin-walled, with tightly joined squamous cells E. Thick-walled, with overlapping squamous cells
The function of B cells in the immune response is ________
A) to attack bacteria B) to attack virus-infected cells C) to attack tumor cells D) to produce plasma cells that make antibodies