A single bone in the neck region, which supports the tongue, is the ________.
A. hyoid
B. fibula
C. clavicle
D. sacrum
E. coxal bone
Answer: A
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Vision impairment as a result of old age and the loss of elasticity in the lens is called ________
A) Diplopia B) Myopia C) Astigmatism D) Presbyopia
During the relative refractory period, an initial threshold-level depolarization is usually not sufficient to trigger an action potential. Why?
A) Some Na+ channels have returned to their resting position and K+ channels are still open, so Na+ entry is offset by K+ loss. B) Only some Na+ channels have returned to their resting position. C) Only K+ channels are still open, so Na+ entry is offset by K+ loss. D) The statement is incorrect; a threshold-level depolarization always triggers an action potential. E) Only a few K+ channels have returned to their resting position.
Membrane attack complexes (MAC) form holes in attacked cells causing them to burst; this is a result of ________
A) interferon B) complement fixation C) natural killer cells D) keratin E) phagocytes
Most of the skin is ________ mm thick
A) 1 to 2 B) 0.01 to 0.02 C) 100 to 200 D) 10 to 20 E) 0.1 to 0.2