To maintain homeostasis, the respiration system depends on the nervous system for signals to

a. exchange gases with circularly system
b. enhance the amount of available oxygen in the lungs
c. release enzyme to increase the the exchange of gases
d. coordinate the muscles the control breathing

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."

. ph changes the ability of them he enzyme to dissolve in water.