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

Anatomy & Physiology

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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.

Anatomy & Physiology

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

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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

Anatomy & Physiology

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

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