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Monday 26 May 2014

Endocrine Glands.

http://en.wikipedia.org/wiki/Endocrine_gland

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the bloodrather than through a duct. The major glands of the endocrine system include the pineal glandpituitary gland,pancreasovariestestesthyroid glandparathyroid glandhypothalamusgastrointestinal tract and adrenal glands. The hypothalamus and pituitary gland are neuroendocrine organs. Local chemical messengers, not generally considered part of the endocrine system, include autocrines, which act on the cells that secrete them, and paracrines, which act on a different cell type nearby.

Gonads


The ovaries of the female, located in the pelvic cavity, release two main hormones. Secretion of estrogens by the ovarian follicles begins at puberty under the influence of FSH. Estrogens stimulate maturation of the female reproductive system and development of the secondary sexual characteristics. Progesterone is released in response to high blood levels of LH. It works with estrogens in establishing the menstrual cycle.
The testes of the male begin to produce testosterone at puberty in response to LH. Testosterone promotes maturation of the male reproductive organs, development of secondary sex characteristics, and production of sperm by the testes.
      The major endocrine glands: 1 Pineal gland 2 Pituitary gland 3 Thyroid gland 4Thymus 5 Adrenal gland 6 Pancreas 7 Ovary(female)
8 Testis (male).

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