Question

7. Write the source and functions of the following:
(a) Thyroxine
(b) Adrenaline
(c) Insulin.​

Answer 1

1) Thyroxine

source - the source of thyroxine is Iodine .

Function - This hormone is secreted by the thyroid gland. The thyroid is located in the neck/throat. region. It is the main hormone secreted into the bloodstream. It regulates carbohydrate, protein & fats metabolism process.

2) Adrenaline

This hormone is secreted by adrenal. The adrenal gland is located above both kidneys. It regulates blood pressure (increasing) heartbeat, carbohydrate metabolism (during an emergency). Adrenaline is carried in the bloodstream and affects the autonomous nervous system, which controls functions such as the heart rate, dilation of the pupils, and secretion of sweat and saliva

3) Insulin

This hormone is secreted by the pancreas. The pancreas is located below the stomach. It reduces and regulates the blood sugar level by a feedback mechanism. It, therefore, helps cells to take in glucose to be used for energy.

Hope it helps

Answer 2

Explanation:

Source of secretion:

1) Thyroxine: Thyroid gland

2) Insulin: β cells of Islet of Langerhans of Pancreas

3) Growth Hormone: Anterior Pituitary gland.

Functions of these hormones:

1) Thyroxine: It plays a vital role in digestion, heart and muscle function, brain development and maintenance of bones.

2) Insulin: maintains the blood sugar level by facilitating the uptake of glucose in hepatocytes and adipocytes thus maintaining hypoglycemia in the bloodstream.

3) Growth Hormone: raises the concentration of glucose and free fatty acids in blood helping with the growth and anabolic effects on the body tissues.