Adrenal glands

Adrenal Glands are located one above each kidney. The adrenal gland is divided into an […]

Amine hormones

Amines are derived from the amino acid tyrosine and are secreted from the thyroid and […]

Antidiuretic hormone

One non-sex hormone secreted by the posterior pituitary is antidiuretic hormone or ADH. This hormone […]

Biological cycles

Biological cycles ranging from minutes to years occur throughout the animal kingdom. Cycles involve hibernation, […]


The endocrine system is composed of endocrine glands located throughout the body. These ductless glands […]


Another group of non-sex hormones that many people have heard of is the endorphins, which […]

Gonadal hormones

Hypothalamus: Gonadotropin-releasing hormone (GRH) Ant. Pituitary: Luteinizing hormone & follicle-stimulating hormone Testes: Testosterone Ovaries: Estradiol […]


Gonadotropins and secreted by the anterior pituitary. Gonadotropins influence the gonads. Gonadotropins (which include follicle-stimulating […]

Growth hormone

Growth hormone (GH) is a peptide anterior pituitary hormone essential for growth. GH-releasing hormone stimulates […]


Hypothalamus releases gonadotropin Releasing hormone (GnRH), causing pituitary to release LH (stiumalting ovulaiton) The hypothalamus […]


Insulin is a peptide hormone secreted by the pancreas and results in the lowering of […]

Leutinizing hormone

Leutinizing hormone (LH) causes the bursting of the follicle in a woman's ovaries, and also […]


Melatonin promotes sleep and decreases activity of the gonads. In addition, melatonin affects thyroid and […]


The pancreas contains exocrine cells and endocrine cell clusters. Exocrine cells secrete digestive enzymes into […]

Peptide hormones

Polypeptides are short chains of amino acids; most hormones are peptides. They are secreted by […]


Pheromones are also communication chemicals used to send signals to other emmebers of same species. […]

Pineal gland

The pineal gland secretes melatonin and is one of the brain's only unitary structures. The […]

Pituitary gland

The pituitary gland consists of a stalk linking the pituitary to the hypothalamus, which controls […]

Steroid hormones

Steroids are lipids derived from cholesterol. Testosterone is the male sex hormone. Estradiol, similar in […]

Thyroid gland

Thyroid Gland is located in the neck. Thyroid follicles secret thryoglobulin, a storage form of […]

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