Human Endocrine System

It regulates the condition of the endometrium of the uterus.

Adrenaline (epinephrine) is the primary hormone released by adrenal glands during stressful situations, preparing the body for 'fight or flight' response. It increases heart rate, blood pressure, and energy availability. Noradrenaline also plays a role but adrenaline is the primary hormone.

In addition to its excretory and homeostatic roles, the kidneys also release two important hormones into the blood. These are: 1.Erythropoietin, which acts on bone marrow to increase the production of red blood cells, and 2.Calcitriol- which promotes the absorption of calcium from food in the intestine and acts directly on bones to shift calcium into the bloodstream.

It is a hormone which is detected during pregnancy test and produced by the syncytiotrophoblast, a portion of the placenta.

The best known and most abundant steroid in the body is cholesterol. Cholesterol is formed in the brain tissue, nerve tissue. It is also used for transformation.

Leydig cells are found adjacent to the seminiferous tubules in the testicle. They produce testosterone in the presence of luteinizing hormone (LH). Leydig cells are polyhedral in shape, display a large prominent nucleus, an eosinophilic cytoplasm and numerous lipid-filled vesicles.

Testosterone is a steroid hormone from the androgen group . In mammals, testosterone is primarily secreted in the testes of males and the ovaries of females, although small amounts are also secreted by the adrenal glands. It is the principal male sex hormone and an anabolic steroid.

Estrogen is a hormone that comprises a group of compounds, including estrone, estradiol and estriol. It is the main sex hormone in women and is essential to the menstrual cycle. Although estrogen exists in men as well as women, it is found in higher amounts in women, especially those capable of reproducing.

The hormone human chorionic gonadotropin (better known as HCG) is produced during pregnancy. It is made by cells that form the placenta, which nourishes the egg after it has been fertilized and becomes attached to the uterine wall.

Progesterone is a steroid hormone involved in the female menstrual cycle, pregnancy (supports gestation) and embryogenesis of humans and other species. Progesterone belongs to a class of hormones called progestogens, and is the major naturally occurring human progestogen.

Thyroxine production requires the presence of iodine.

Insulin is a hormone secreted by the pancreas. It plays a key role in the regulation of blood glucose levels.

Adrenals also produce the hormone adrenalin. It helps the body to adjust to stress when one is very angry, embarrassed or worried.

The hormone secreted by Leydig cells is testosterone.

Lutinising Hormone stimulates leydig cells for secreting testosterone.