Question

Which of the following pairs of hormones are not antagonistic to each other?

• A. Relaxin-Inhibin
• B. Parathormone-Calcitonin
• C. Insulin-Glucagon
• D. Aldosterone-Atrial natriuretic factor

Answer 1

The correct option is A

Relaxin-Inhibin

The correct option is A.

The explanation for the correct option:

1. Relaxin is a hormone produced by the corpus luteum of the ovary that plays a vital function in female pregnancy.
2. It is found in male sperm and is secreted by the prostate gland.
3. Relaxin levels rise fast on the 14th day after ovulation, and in the absence of pregnancy, relaxin levels fall and menstruation occurs.
4. It is vital in individualization because it works in combination with steroid hormones to prepare the endometrial layer for implantation.
5. The granulosa cells in the ovaries secrete inhibin hormone, which inhibits the anterior pituitary gland's secretion of follicle-stimulating hormone.

The explanation for incorrect options:

Option B:

1. Parathromone raises blood calcium levels via increasing calcium release from bones and inhibiting calcium reabsorption from the intestine.
2. Calcitonin lowers blood calcium levels and is produced by the thyroid gland's C cells.
3. C cells are also called parafollicular cells.

Option C:

Insulin and glucagon have antagonistic effects since the former lowers blood glucose levels while the latter raises them.

Option D:

Aldosterone reduces the release of atrial natriuretic factors and has a physiologically antagonistic effect on it.

Final Answer: Relaxin-Inhibin hormones are not antagonistic to each other.