Question

The given figure shows the feedback relationship between three glands and their hormones

The secretion of b is decreased by 'a', the secretion of 'c' is increased by 'b' while the secretion of 'a' is decreased by 'c'. Increased or decreased amounts of a hormone cause an increase or decrease in the amount of the following hormone in the system. Now if 'a' is added to the system, the secretion of 'c' is
A.Decreased
B.Increased
C.First decreased and then increased
D.First increased and then decreased

Answer 1

Hint:
The procedure by which the hormone is balanced is perpetuated in the bloodstream is known as the feedback mechanism of hormones. The increase or decrease in the concentration of that hormone can either stimulate the secretion of that particular hormone or inhibit the hormone secretion.

Complete answer:
The amount of hormones and timing of secretion of hormones in our body by various glands are in control of the feedback mechanism. A common example of a feedback mechanism is the regulation of sugar levels by insulin. If the sugar level in the blood increases beyond the normal level, then insulin is secreted so that the sugar level in the body is maintained. Similarly, if the blood sugar level is fall below normal then glucagon stimulates the breakdown of glycogen to glucose thereby maintaining the normal sugar level.
Increasing the amount of ‘a’ decreases the secretion of ‘b’. Since increasing ‘b’ increases the secretion of ‘c’, decreased ‘b’ leads to decreased ‘c’ which in turn leads to the increased secretion of ‘a’
Hence the correct answer is Decreased

Option ‘A’ is correct

Note:
The hormones are directly secreted into the blood. They play a vital role in the growth, development, and metabolism process of certain cells and organs in our body. There are various types of hormones present in animals that help in different functions of the body.