Question

Explain chemical coordination in humans and give the names and functions of some hormones. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [Textbook Question 6a pg no.178]

Answer 1

Answer

1. In chemical coordination, a group of cells produce specific chemicals which regulate the activities of the body. Hormones play the role of chemical coordination in our body. The endocrine glands and hormone-producing cell or tissues together form the endocrine system.
2. Different hormones have a different function that is they have specific physiological action which may be excitatory or inhibitory.

• The pituitary gland secretes growth hormone which is an anabolic hormone helpful for the growth of bones. It also secretes a thyroid-stimulating hormone which simulates thyroid gland and secrets adrenocorticotropic hormone which functions on adrenal glands present anterior to the kidney.
• Thyroid gland secrets iodinated hormone called thyroxine, essential for the growth and releases Calcium regulating hormone called calcitonin. The parathyroid gland is present behind thyroid gland which releases parathormone. Calcitonin and parathormone together control the calcium level in the blood.
• Testosterone released by male gonad testis is mainly responsible for the secondary sexual characteristics of men.