Why are urination and defecation under voluntary control?
A. The external and anal sphincters are composed of skeletal muscle tissue.
B. The external and anal sphincters are composed of multi-unit muscle tissue.
C. The nerves that supply external urethral and anal sphincters have varicosities.
D. The urogenital diaphragm is voluntary while the pelvic diaphragm is involuntary.
E. The external urethral and anal sphincters are innervated by the autonomic nervous system.
Answer: A
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