The thymus gland plays an important role in the development of the immune system by producing and maturing T cells, which are important for fighting off infections and diseases. It does not secrete calcitonin (option A), regulate reproductive organs (option C), produce a hormone that is antagonistic to calcitonin (option D), or regulate sleep/wake cycles (option E).

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The Thymus Gland

Question 50

Multiple Choice

The thymus gland

A) secretes calcitonin for the regulation of calcium levels
B) plays an important role in the development of the immune system
C) has an important role in the development of the reproductive organs
D) secretes thymosin which is antagonistic to calcitonin
E) secretes thymosin which regulates sleep/wake cycles

Correct Answer: