A deficiency of which of the following stem cells would result in a marked increase in the clotting time of blood?
A. lymphoblast
B. megakaryoblast
C. monoblast
D. myeloblast
E. proerythroblast
B
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What is the function of melanin?
A) It provides water-resistant properties to the integument. B) It continuously divides to replace cells that are lost or shed at the epithelial surface. C) It is converted by the kidneys into the hormone calcitriol. D) It is required for the normal maintenance of epithelial cells. E) It protects DNA from the damaging effects of ultraviolet radiation.
Age related changes include all of the following EXCEPT:
A) Cell division is slower. B) Red blood cell synthesis decreases. C) Injury healing time is slower. D) Collagen fibers decrease and become more flexible. E) All of these are age related changes.
Voluntary micturition
A. involves higher brain centers. B. involves control of the internal sphincter. C. is a reflex action. D. is common in infants. E. involves control of smooth muscle.
Preganglionic fibers run from the ________ to the ________
A) gray matter; posterior root ganglia B) autonomic ganglia; visceral effectors C) posterior root ganglia; gray matter D) gray matter; autonomic ganglia E) posterior root ganglia; autonomic ganglia