The orgasm-emission phase of the male sexual response is stimulated by ________.
A. efferent parasympathetic signals from the sacral region of the spinal cord
B. efferent somatic signals from the thoracic region of the spinal cord
C. efferent parasympathetic signals from the lumbar region of the spinal cord
D. efferent sympathetic signals from the lumbar region of the spinal cord
E. efferent sympathetic signals from the sacral region of the spinal cord
Answer: D
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Fill in the blank(s) with the appropriate word(s).
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