what is not an obstacle sperm face within the female reproductive system??

How Sperm Meets Egg | Parents

Many sperm are overcome by the acidity of the vagina, others are blocked by mucus in the cervix, whereas others are attacked by phagocytic leukocytes in the uterus. Those sperm that do survive undergo a change in response to those conditions.

Pathway of sperm cells through the female reproductive system

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