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The very low viscosity of Es intermicellar fluid allows very rapid sperm migration.

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Given this expected high spermatozoa loss, a slight modification in cervical mucus may rapidly transform the cervix into a "hostile" Espermatozoides en la vagina, which, together with changes in vaginal environment and cervix structure, may prevent natural conception and be a cause of infertility.

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Most of such defects occur in women whose mothers had used diethylstilbestrol, a synthetic nonsteroidal estrogen, which was banned from the marketplace in

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The concentration of different proteins in mucus varies during the menstrual cycle, being lowest at ovulation.

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The same is true when semen becomes acidic, which may occur as a result of obstruction in the ejaculatory ducts and due to hypoplasic seminal vesicles.

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From an average of to million sperm deposited in the vagina, only a few hundred achieve proximity to the oocyte.

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Although it is well established that the vaginal pH and cervical mucus play important roles in maintaining sperm function after intercourse, their importance in unexplained infertility is generally underestimated.

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Then, this coagulum is gradually liquefied during the next minutes by seminal-fluid proteolytic enzymes produced by the prostate gland.

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A few ciliated cells among the secreting cells propel the cervical mucus from the crypt of origin toward the canal.

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Clomiphene citrate is structurally similar to estrogen, which allows it to bind to estrogen receptors throughout the reproductive system.

The nonciliated cells secrete mucin in granular form through exocytosis.

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