Chapter 12, Problem 1CP

List three common causes of persistent nipple pain.

Watch this video (http://openstaxcollege.org/l/vasectomy) to learn about vasectomy. As described in this video, a vasectomy is a procedure in which a small section of the ductus (vas) deferens is removed from the scrotum. This interrupts the path taken by sperm through the ductus deferens. If sperm do not exit through the vas, either because the man has had a vasectomy or has not ejaculated, in what region of the testis do they remain?

Fertility specialists may advise a couple who wish to conceive a child to use an alkaline (basic) douche immediately before intercourse. What might the reasoning behind this advice be?