Question

An adenohypophysis hormone which is regulated by feedback mechanism.
A. TSH
B. Cortisone
C. Calcitonin
D. Oxytocin

Answer 1

Feedback mechanism is a mechanism of the body operating to control the output of hormones to take the hormones circulating in the blood to the normal level. Basically, it is a loop in which any hormone controls its own production to bring it to a normal level. This feedback mechanism mainly operates on the hypothalamus.

Complete answer: Mainly there are two types of feedback mechanism:
-Negative feedback mechanism- When the hormone feedback lowers its production to bring it to a normal level. A classical example of this mechanism is Thyroid hormone regulation.
-Positive feedback mechanism- This type of feedback mechanism occurs when to increase the level of hormone in the blood to increase the production of the resulting product of that hormone. A classical example of this mechanism is prolactin when suckling baby milk from mother prolactin follows this mechanism.
In option -A- TSH is mentioned. TSH is a hormone of adenohypophysis which regulates the function of thyroid hormone i.e., thyroxin. When the circulating level of thyroxine is increased a negative feedback loop operates on the hypothalamus and anterior pituitary to control its secretion.
In option -B- Cortisone is mentioned. First of all this hormone is not secreted by any gland of the body. It is a synthetic hormone that resembles a corticosteroid in structure. So there is no chance of its operation following the feedback mechanism.
In option -C- Calcitonin is mentioned. This hormone is produced by the thyroid gland which acts contrary to the hormone produced by the parathyroid gland to control the level of calcium in the body.
In option -D- Oxytocin is mentioned. Basically, this hormone is produced by the hypothalamus and by neuronal stalk it reaches to neurohypophysis of the pituitary gland stored here and from where it is supplied in the body.
So, the correct answer to this question is option” A” i.e. TSH

Note: Basically pituitary gland has a part known as adenohypophysis that produces GH, TSH, ACTH, LH, FSH and Prolactin also MSH plus and neurohypophysis that stores Oxytocin and Vasopressin. The production of these hormones is controlled by the hypothalamus by its secreting hormones.