Human Endocrine System

Vasopressin (ADH) is synthesized in the hypothalamus and stored and released into the bloodstream by the posterior pituitary gland.

FSH stimulates the growth and recruitment of immature ovarian follicles in the ovary. FSH stimulates primary spermatocytes to undergo the first division of meiosis, to form secondary spermatocytes.

The presence of thyroxin causes the tadpoles to become adult frog.

Progesterone pregnancy maintaining hormone. Aldosterone maintains the balance of salts and water in blood. Adrenaline helps in defense of the body in emergency situations.

Glucagon increases the blood sugar level whereas insulin decreases it. Thyroxin regulates growth of our body.

Adrenaline helps in defense of the body in emergency situations.

Estrogen levels peak towards the end of the follicular phase, which causes a surge in levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This lasts from 24 to 36 hours, and results in the rupture of the ovarian follicles, causing the oocyte to be released from the ovary via the oviduct.

Prolactin is a protein that in humans is best known for its role in enabling female mammals to produce milk.

Beta cells of pancreas secrete insulin

A hormone is class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behavior.

It plays a central role in the regulation of blood pressure mainly by acting on the distal tubules and collecting ducts of the nephron, increasing reabsorption of ions and water in the kidney, to cause the conservation of sodium, secretion of potassium, increase in water retention, and increase in blood pressure and blood volume.

Hormones are secreted by glands with the help of ducts at specific sites or directly pour their secretions in into the blood. Enzymes are only secreted at their site of action.

Estrogen and progesterone are produced by ovary.

Oxytocin hormone helps in the ejection of milk from the breast. Oxytocin is normally produced in the hypothalamus and stored in the posterior pituitary gland.

The female sex hormone estrogen is produced by cells of graafian follicle.  Graffian Follicle is a fluid-filled structure in the mammalian ovary within which an ovum develops prior to ovulation.