Matt and monica have been trying to get pregnant for two years. no wonder it is so difficult! they just found out that the average couple is fertile for only about days each month.

The answer is an average couple is fertile for only 6-7 days.  If a couple cannot produce healthy sperm and egg there are the various treatment to help infertile couples to become pregnant and can have their own child. Infertility happens if there is the failure to conceive consecutive 12 months despite the attempts.

human didn't come from monkeys man i hate these stupid teachers

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.