REGULATION OF HORMONAL SECRETION ::
The feed back Mechanism The anterior pituitary hormones besides controlling growth and metabolism of protein fat and carbohydrates control the other endocrine glands The pituitary gland is thus described as the master gland
Any fall of the hormone level (e.g. thyroid hormone ) in the blood stimulates the hypothalamus which secretes the respective releasing factor e.g. growth hormone releasing factor thyrotrophic releasing factor This is turn stimulates the pituitary gland to secrete the trophic hormone (viz. thyrotrophic hormone) which finally stimulates the gland to increase the release of that particular hormone This process of stimulation of a particular endocrine gland in response to decrease in the hormone level in the blood is known as positive feed back mechanism
The processes are reversed when there is rise of a particular hormone The process of inhibition of a particular endocrine gland in response to increase in the hormones level in blood is described as Negative feed back mechanism
Thus although the anterior pituitary gland controls the other endocrine glands it is ultimately controlled by the hypothalamus The anterior pituitary gland is described as the orchestra and hypothalamus as the queen of the endocrine orchestra
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