Feedback mechanism is an important aspect of hormonal coordination. Explain.
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Explanation: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.