Feedback Mechanism in Hormones 

The conditions inside the hormones are altered in response to a stimulus. The hormones are responsible for regulating the internal body temperature. A feedback mechanism tends to speed up or inherit a procedure. Among most of the hormones, this loop usually provides negative feedback. 

Negative Feedback Mechanism

• Negative feedback mechanism occurs when the original effect of the stimulus is less by the output.

• Negative feedback mechanisms smoothen things when they start becoming too extreme. Example of a negative feedback mechanism is the thyroid gland that 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 there is an increase in the  thyroid levels, the hormones put a hold on the secretion of TRH by the hypothalamus and secretion of TSH by the pituitary gland by the feedback mechanism.

• The hormone secretion by the thyroid gland is inhibited without the stimulation of TSH.

• The thyroid hormone levels fall very low.

• The secretion insulin by the pancreas is also being controlled by the negative feedback mechanism.

Positive Feedback Mechanism

• It takes place when the original effect of the stimulus is enhanced by the output.

• The conditions become extreme in this mechanism.

• When milk is secreted by a mother’s mammary glands that is an example of a 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.

What are Hormones?

The essential chemicals that are secreted from our body for the smooth functioning of the body are called Hormones. These chemicals are secreted from a gland known as the Endocrine Glands which are distributed throughout the body. These chemicals control many functions like physiological and psychological. Hormones are very important for maintaining a balance in the body. 

Functions of Hormones

Some of the important functions of hormones are the following - 

• It helps in food metabolism.

• It helps in the growth and development of the body

• Helps in controlling the thirst and hunger.

• Maintaining body temperature.

• Regulating mood and cognitive functions.

• Initiating and maintaining sexual development and reproduction.

List of Important Hormones

• Estrogen- Also, termed as the sex hormone in women, this hormone helps in bringing out puberty, prepared the uterus and body for pregnancy and also helps in regulating periods. As the level of estrogen changes in women during menopause, they might feel a little uncomfortable.          

• Progesterone – This hormone is also a female sex hormones which functions for the regulation of the menstrual cycle leading to pregnancy and embryo genesis.

• Cortisol – This is the hormone that is present in our body and shows symptoms when we are tensed, called the Stress Hormones. This hormone increases the blood sugar, increases the heart rate and makes the body shiver. 

• Melatonin – Primarily circadian rhythm or sleep cycles are controlled by this hormone. 

• Testosterone – The feeling of sex that is caused during pubery in men is caused by Testosterones. muscle mass growth, and strength, increase in bone density and facial hair growth, all are controlled by this hormone in men.