Question

which of the following statements regarding the thymus gland or its hormone is not true?
a the thymus secretes thymosin.
b thymosin is important for proper development of the immune system.
c at puberty, the thymus gland begins to shrink.
d the thymus gland is located in the mediastinum just below the heart.

Explanation:

• Option A: The thymus does secrete thymosin. Thymosin has roles in T - cell development.
• Option B: Thymosin is crucial for the proper development of the immune system as it helps in the maturation of T - lymphocytes.
• Option C: At puberty, the thymus gland starts to atrophy (shrink) as the immune system has already developed to a large extent.
• Option D: The thymus gland is located in the mediastinum, but it is just above the heart, not below.

Answer:

D. The thymus gland is located in the mediastinum just below the heart.