There are fewer T cells as we age because the thyroid gland decreases in size.
There are fewer T cells as we age because the thymus gland decreases in size.

Question

Quizplus · Accepted Answer

The thymus gland is responsible for the production of T cells, and it does decrease in size as we age, leading to fewer T cells. The thyroid gland, however, is not directly involved in the production of T cells.

There Are Fewer T Cells as We Age Because the Thyroid