Myelination of axons is accomplished in the nervous system by and in the nervous system by
a. central, Schwann cells, peripheral, oligodendrocytes
b. vertebrate, Schwann cells, invertebrate, oligodendrocytes
c. central, oligodendrocytes, peripheral, Schwann cells
d. vertebrate, oligodendrocytes, invertebrate, Schwann cells
C
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When a finger is pricked, the blood will stop flowing shortly because of the action of the formed elements called ________.
Fill in the blank(s) with the appropriate word(s).
An increase in the partial pressure of oxygen causes pulmonary arterioles to ________, thereby altering _______ to make gas exchange more efficient
A. constrict; perfusion B. dilate; perfusion C. constrict; ventilation D. dilate; ventilation
The __________ nerve carries sensory fibers for sight.
Fill in the blank(s) with the appropriate word(s).
A child is born with a genetic mutation in which the plasminogen protein is absent in blood plasma. How will this affect hemostasis?
A. Blood clots will not be dissolved because plasminogen becomes a clot-dissolving substance. B. Plasminogen activates Factor III to begin the extrinsic clotting mechanism, so clotting will be prevented. C. Clotting will be prevented because plasminogen activates Hageman Factor to begin the intrinsic clotting mechanism. D. Plasminogen causes platelets to adhere to collagen in the broken surfaces of blood vessels, so the platelet plug will not form.