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Infertility usually occurs 

A. When the sperm count is reduced to 10 per cent of normal. 

B. When posterior pituitary function is lost. 

C. When one uterine tube is blocked. 

D. In males with undescended testes. 

E. Because of a reproductive disorder in the female partner.

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A. True Even though only one sperm ultimately fuses with the ovum. 

B. False Vasopressin and oxytocin are not needed for fertilization. 

C. False This would only reduce fertility moderately. 

D. True The higher temperature in the abdomen impairs function in the spermatogenic epithelium. 

E. False Male and female causes are about equally common in infertile couples.

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