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Feedback Mechanism Of Hormones

The hormones are responsible for regulating the internal body temperature. A feedback mechanism tends to accelerate or inhibit the hormonal secretion. This loop is usually the negative feedback mechanism among most of the hormones.

Negative Feedback Mechanism

  • It occurs when the original effect of the stimulus is reduced by the output.
  • Negative feedback mechanism normalizes the things when they start becoming too extreme. For eg., the thyroid gland is regulated by a negative feedback mechanism.
  • The hormone secreted by the hypothalamus stimulates the pituitary gland to release thyroid stimulating hormone.
  • In turn, the thyroid stimulating hormone triggers the thyroid gland to release its hormones.
  • When the thyroid level increases, the hormones stop the secretion of TRH by the hypothalamus and secretion of TSH by the pituitary gland by the feedback mechanism.
  • The secretion of hormones by the thyroid gland is inhibited without the stimulation of TSH.
  • The thyroid hormone levels fall very low.
  • The insulin secretion by the pancreas is also controlled by the negative feedback mechanism.

Also read: Hormones

Positive Feedback Mechanism

  • It occurs when the original effect of the stimulus is enhanced by the output.
  • The conditions become extreme in this mechanism.
  • Milk secreted by a mother’s mammary glands is one of the examples of positive feedback mechanism.
  • While suckling, the nerve sends signals from the nipple to stimulate the pituitary gland to secrete prolactin.
  • In turn, prolactin triggers the mammary glands to secrete milk.
  • As the baby suckles more milk, more prolactin is secreted and more milk is produced.

Further Reading: Thyroid Gland

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