Question

Choose the correct answer from the alternatives given.
An example of homeostasis control by antagonistic hormones is:

• A. insulin and glucagon in glucose metabolism
• B. progestins and estrogens in sexual differentiation
• C. epinephrine and norepinephrine in flight or fight response
• D. oxytocin and prolactin in milk production

Answer 1

The correct option is A insulin and glucagon in glucose metabolism

A growth factor is a naturally occurring substance capable of stimulating cellular growth, proliferation, healing, and cellular differentiation. Usually, it is a protein or steroid hormone. They are important in regulating a variety of cellular processes. Growth factor typically acts as signaling molecule between cells. Examples are cytokines and hormones that bind to specific receptors on the surface of their target cells.
So the correct answer is are proteins that bind to the surface receptors and stimulate target cells growth and development. the concentration of blood glucose level rises insulin stimulates the liver and most other body cells to absorb glucose. Liver and muscle cells convert the glucose to glycogen, and adipose cells convert the glucose to fat. In response, glucose concentration decreases in the blood, and insulin secretion discontinues ( through negative feedback).

When the concentration of blood glucose drops glucagon stimulates the liver to release glucose. The glucose in the liver originates from the breakdown of glycogen and the conversion of amino acids and fatty acids into glucose. When blood glucose levels return to normal, glucagon secretion discontinues (negative feedback).

So the correct answer is insulin and glucagon in glucose metabolism.