Q:

Erection of the penis

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Erection of the penis.


  1. Cannot occur before puberty.
  2. Is normally initiated by venoconstriction.
  3. Depends on adrenergic sympathetic nervous activity.
  4. Cannot occur after cervical spinal cord transection.
  5. Is inhibited by ganglion-blocking drugs.

All Answers

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A. False It is not uncommon in infants.

B. False It is normally initiated by arteriolar dilatation.

C. False It depends on parasympathetic cholinergic nerves; activity in sympathetic nerves is required for ejaculation.

D. False It is based on a spinal reflex.

E. True These block sympathetic and parasympathetic pathways.

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