female anatomy
‘The Vagina’
The vagina is a thin walled-tube, 8 to 10 cm long. It lies between the
bladder & the rectum & extends from the cervix to the body exterior. The
urethra is embedded in its anterior wall. Often called the birth canal, the
vagina provides a passageway for delivery of an infant & for menstrual
flow. Since it receives the penis (& semen) during sexual intercourse, it is
the female organ of copulation.
The highly distensible wall of the vagina …
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…the vagina are
incapable of penetrating a oocyte. They must first be capaciated (their
membranes must become fragile so that the hydrolytic enzymes in their
acrosomes can be released). The sperm that arrive first on the scene help
break down the outer layer of the egg, so other sperm can penetrate it;
only one sperm is allowed in, after that there is an electrical event called
the ”fast block to polyspermy.” Then when the 2 pron
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