The pelvic diaphragm is formed by the
A. coccygeus only.
B. deep transverse perineum muscle.
C. levator ani and coccygeus muscles.
D. levator ani only.
E. sphincter urethrae and sphincter ani muscles.
Answer: C
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The gastrocolic reflex
A. usually occurs during or immediately after a meal. B. propels fecal material toward the rectum. C. generally occurs two or three times per day. D. involves mass movements generated by the teniae coli. E. All of the choices are correct.
The statement "Preganglionic axon terminals release acetylcholine" is
A) true only for the parasympathetic nervous system. B) true only for the sympathetic nervous system. C) true for both the parasympathetic and sympathetic nervous systems. D) not true for either the parasympathetic or sympathetic nervous systems. E) true only for the somatic nervous system.
A red blood cell placed in pure water would ________.
A) shrink B) swell initially, then shrink as equilibrium is reached C) neither shrink nor swell D) swell and burst
The airways most responsible for the resistance of the respiratory system (Raw) during mouth breathing are:
A. the trachea, main stem, and lobar bronchi B. the terminal bronchioles C. the respiratory bronchioles D. the alveoli and alveolar ducts