Human Endocrine System

Endocrine System: The endocrine system is a messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In invertebrates, the hypothalamus is the neural control center for all endocrine systems. In humans, the major endocrine glands are the thyroid gland and the adrenal glands. The study of the endocrine system and its disorders is known as endocrinology.

Human endocrine system

  1. Hypothalamus. It has hormone-producing neurosecretory cells. Some of these hormones are taken to the anterior pituitary through a portal vein where they function as releasing (RH) or inhibitory hormones (IH), e.g., TSH-RH, TSH-IH, GH-RH, GH-IH. Two hormones are taken to the posterior pituitary by nerve cells.
  2. Pituitary Gland. It is a pea-shaped small but most important gland of the body which is attached to the hypothalamus by a stalk. It is called the master gland because many of its secretions control the functioning of other endocrine glands. The pituitary gland has three parts-anterior, posterior and inconspicuous middle. Their important hormones are as follows:

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