Pineal Secretes melatonin, a hormone involved with daily biological rhythms.

Pituitary The master gland, secretes hormones that influence many other glands and organs, affecting growth and reproduction.

Thyroid Regulates metabolism and blood calcium levels.

Parathyroid Regulates the use of calcium and phosphorus.

Thymus Stimulates T-cell development for the immune system.

Adrenal Secretes androgens ("male" hormones), and aldosterone, which helps maintain the body's salt and potassium balances. Also epinephrine (adrenaline) and norepinepherin (noradrenaline) which are involved in "fight or flight" responses.

Pancreas Secretes insulin, the hormones controlling the use of sugar in the body, and other hormones involved with sugar metabolism.

Ovaries Secrete "female" hormones estrogen, which develops and maintains female characteristics, and progesterone, which prepares the uterus for pregnancy.