Question

How is timing and amount of hormone secretion regulated in humans? Explain giving an example.

Answer 1

Hint: We have different glands in different part of the body that produce different hormones. These hormones are involved in the regulation and maintenance of different body functions.

Complete step by step answer:
To solve this question, we should know about the hormones. Hormones are called the chemical messengers as they secreted directly in the circulatory system. With the help of blood the hormones are reached to the organs and the tissue to maintain their function. There are many types of hormones that are secreted in the body to maintain the processes and function.
 Thyroxine and triiodothyronine are the two hormones secreted by thyroid glands, insulin, estrogen, progesterone, cortisol, etc. There are some hormones which are produced from nerve cells instead of endocrine glands they are termed as neurohormone. They are passing along the nerve cell and releasing to the blood in a region termed as neurohemal organs.
Epinephrine and norepinephrine are the hormones which are produced by the adrenal gland and also by the nerve cells, therefore they are the neurohormones. The hormone produced by the nerves and released to the bloodstream to continue the function. These hormones together are known as catecholamine that releases inside the circulatory system when a person is having some emotional stress. The norepinephrine, epinephrine, and dopamine are the main catecholamines.
Now, the timing and the amount of hormone to be secreted is regulated by a feedback mechanism. For example the pancreas involved in the secretion and release of insulin when the positive feedback is given by the increased blood sugar level, the insulin sequesters the sugar in adipose tissue and hepatocytes as glucose and fats respectively. When the blood sugar level decreases the negative feedback will instruct the pancreas to stop the insulin secretion.

Note: Steroid hormones are classified into; progestogens, oestrogens, glucocorticoids, androgen, and mineralocorticoids. These hormones are secreted by the three steroid glands; ovaries, testes, and adrenal cortex and placenta during pregnancy.