I'm pretty sure its from the stomach.
The answer is A.It releases spermicide into the uterus to keep sperm from fertilizing eggs. Hope this helps
Explanation:
Isotonic contractions generate force by changing the length of the muscle and can be concentric contractions or eccentric contractions. A concentric contraction causes muscles to shorten, thereby generating force. Eccentric contractions cause muscles to elongate in response to a greater opposing force.