Erection (vasodilation) of the penis or clitoris ________
A) is the result of coordinated activation by both sympathetic and parasympathetic input
B) is primarily under sympathetic control
C) is primarily under parasympathetic control
D) depends very little on autonomic activation
C
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Put these myofibers in the order they would be recruited as the body moves from a weak to a strong stimulus:
1. glycolytic fast-twitch fibers 2. fatigue-resistant oxidative fast-twitch fibers 3. fatigue-resistant slow-twitch fibers A) 3, 1, 2 B) 3, 2, 1 C) 2, 3, 1 D) 1, 3, 2 E) 1, 2, 3
The sleep/wake cycle is influenced by the
A. basal nuclei. B. reticular formation. C. vermis. D. thalamic nuclei. E. cerebellum.
Blocking afferent action potentials from the chemoreceptors in the carotid and aortic bodies would interfere with the brain's ability to regulate breathing in response to
A) changes in PCO2. B) changes in PO2. C) changes in pH. D) changes in blood pressure. E) changes in PCO2, PO2, and pH.
The two organ systems that regulate and maintain homeostasis are the
a) cardiovascular and integumentary systems. b) nervous and endocrine systems. c) cardiovascular and respiratory systems. d) respiratory and muscular systems. e) urinary and integumentary systems.