- Steroid: is a four-ring structure derived from cholesterol, including estrogen, progesterone, testerone, and vitamin D
- Pepitide Hormone: made of amino acid chains, and produced in posterior pituitary gland and also in hypothalamous.
- Modified Amino Acid: derived from amino acid, no repine phrind and epinphrine, and modifies tyrosine.
Control of Hormonal Secretions
Control Sources:
- Hypothalamous stimulates other glands secretes hormone.
- Another group of glands responds directly to changes in the composition of the internal environment.
- The nerve cell stimulate the gland responds to the nerve impulse
Negativefeedback
-Control many hormonal secretions
Estrogen
- Its function is to stimulate the release of GnRH from hypothalamus and LH from anterior pituitary glands.