Steroid hormones are manufactured from cholesterol or cholesterol esters.
Examples of Steroid hormones :
I. Testosterone
II. Estrogen
Explain the following :
(1) Insulin lowers the blood sugar level.
(2) Adrenal medulla and the sympathetic nervous system function as a closely integrated system.
(3) Pituitary gland regulates the reproductive system.
(4) Feed back system controls the blood level of many hormones.