The nurse teaching a patient describes the effect of a vasectomy on fertilization by saying "A man who has had a vasectomy becomes functionally sterile because the sperm:
1. "Are no longer being produced.".
2. "Are no longer motile and fertile.".
3. "Sit in the testes where they are formed."
4. "Cannot reach the outside of the body.".
4
Rationale 1: Sperm are produced in the seminiferous tubules in the testes, and are not affected by a vasectomy.
Rationale 2: A vasectomy does not affect motility or fertility of sperm.
Rationale 3: The sperm deteriorate, and are reabsorbed.
Rationale 4: Sperm cannot reach the outside of the body in a man who has had a vasectomy. The main function of the vas deferens, which is ligated in a vasectomy, is to squeeze the sperm from their storage site into the urethra.
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