The penis consists of _____ columns of erectile tissue
A. two
B. three
C. four
D. five
E. six
B
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Which of the following is an inhalation followed by many short convulsive exhalations during which the rima glottidis remains open and the vocal folds vibrate, accompanied by characteristic facial expressions?
a) sneezing b) yawning c) hiccupping d) laughing e) Valsalva maneuver
Caffeine, nicotine, and alcohol all have effects on
A) long-term potentiation. B) synaptic activity. C) action potential conduction. D) neurotransmitter degradation. E) neurotransmitter reuptake.
The principal male sex steroid hormone is ____________________
Fill in the blank(s) with correct word
The fact that most of us have five lumbar vertebrae, but some people have six and some have four, is an example of __________ variation among organisms.
A. cellular B. holistic C. physiological D. anatomical E. reductionist