Which structures develop into the retina?
A) optic vesicles
B) cornea
C) optic nerve
D) inner and outer layers of the optic cup
E) lacrimal apparatus
Answer: D
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Which of the following is not true of monocytes?
A) about same size as basophils B) enter tissues and wander C) become macrophages D) are long-lived E) can phagocytize bacteria
Receptor sites on the outer surface of the plasma membrane are
a. ATP. b. carbohydrates. c. cyclic AMP. d. DNA. e. proteins.
Twitch summation
a. is a means by which gradation of muscle contraction may be accomplished. b. results from increasing the number of motor units that are firing within a muscle. c. results from increasing the frequency at which motor units are firing within a muscle. d. both (a) and (b) above. e. both (a) and (c) above.
Stem cells that can differentiate into osteoblasts are important in
A) osteogenesis. B) bone resorption. C) releasing hydrochloric acid. D) derived from macrophages. E) releasing hydroxyapatite.