Nitric oxide is released by _____ and results in relaxation of penile arteriolar smooth muscle? 1. cavernous nerves of the penis                                                                  2. pelvic splanchnic nerves                                                                               3. postganglionic components of lumbar / sacral splanchnic nerves (A) 1 (B) 2 (C) 3 (D) 1 and 2 (E) 1 and 3

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