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Cervical Mucus Hostility
The cervical mucus is a jelly-like substance produced by minute glands in the
cervical canal. It changes in consistency and composition with the menstrual
cycle. Just before ovulation and under the effect of the hormone estrogen it
becomes very watery and copious to allow the sperm to swim through it. After
ovulation and under the effect of progesterone, the mucus becomes thick and
sticky, which render it impenetrable to the sperm. Once the sperm are in the
mucus, they can stay there for a few days. Thus the mucus acts as a sperm
reservoir.
Cervical mucus hostility is the inability of sperm to penetrate the cervical
mucus. The significance of cervical mucus hostility is disputable among
infertility specialists. Problems with cervical mucus usually cause no symptoms.
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