Which of the following is correct regarding hormones?

Options

A. Parathyroid is essential for absorption of potassium ions.
B. Insulin glucagon maintans blood glucose homeos tasis.
C. Old person is ageing person due to lack of progesterone
D. Thymus gland increases in size with age

Answer

To determine which statement is correct regarding hormones, we will analyze each option provided:

1. **Statement 1: Parathyroid is essential for absorption of potassium ion.**
- The parathyroid hormone (PTH) is primarily responsible for regulating calcium levels in the blood, not potassium. It increases calcium absorption in the intestines and kidneys, and promotes the release of calcium from bones. Therefore, this statement is incorrect.

2. **Statement 2: Insulin and Glucagon maintain blood glucose homeostasis.**
- Insulin, produced by the beta cells of the pancreas, lowers blood glucose levels by facilitating the uptake of glucose into cells. Conversely, glucagon, produced by the alpha cells of the pancreas, raises blood glucose levels by promoting the release of glucose from the liver. Together, these hormones work antagonistically to maintain blood glucose homeostasis. This statement is correct.

3. **Statement 3: An old person is aging due to the lack of progesterone.**
- While hormonal changes do occur with age, progesterone is primarily involved in the menstrual cycle and pregnancy in females. Its decline is not directly responsible for aging. Aging is a complex process influenced by various factors, not solely the lack of progesterone. Thus, this statement is incorrect.

4. **Statement 4: The thymus gland is responsible for immunity, and its size decreases with age.**
- The thymus gland plays a crucial role in the immune system, particularly in the maturation of T-cells. It is true that the thymus gland decreases in size and function with age, but the statement does not provide a correct assertion about hormones. Therefore, this statement is also incorrect.

**Conclusion:**
The correct statement regarding hormones is **Statement 2: Insulin and Glucagon maintain blood glucose homeostasis.**

---