Osteoporosis is characterized by
a. reduced bone mass as a result of diminished laying down of the organic matrix of bone.
b. abnormal bone calcification.
c. hypocalcemia.
d. both (a) and (b) above.
e. all of these answers.
A
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Which of the labeled structures in the diagram is the supraspinous fossa?
a) A b) B c) C d) D e) E
Neurotransmitters are
A) released only at nonvesicular synapses. B) produced by astrocytes. C) stored in synaptic vesicles. D) produced on command. E) never recycled.
Which of the following would increase the rate of glomerular filtration?
A) Increased blood pressure B) A constricted afferent arteriole C) Decreased blood pressure D) A dilated efferent arteriole
A muscle twitch is ________
A) the maximal force a muscle can generate B) a single contraction of skeletal muscle C) an action potential in a muscle D) a twinge that one feels in an isolated muscle