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Sexual arousal mechanism in women to facilitate fecundation

Explain that how does the sexual arousal way in women facilitate fecundation?

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During the sexual arousal in females the vagina secretes substances to neutralize its acidity so permitting the survival of sperm cells within it. While the female fertile period hormones form the mucus which covers the internal surface of the uterus less viscous to support the passage of sperm cells to the uterine tubes. For the period of copulation the uterine cervix advances in the vagina to facilitate the entering of male gametes via the cervical canal.

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