Answer:
The thymus gland is a
lobular structure located on the dorsal side of the heart and the aorta. It is
derived from the endoderm of the embryo. Thymus secretes a hormone named thymosin
which stimulates the development of White Blood Cells (WBCs), involved in producing
immunity.
Thymus is
degenerated in old individuals, resulting in decreased production of thymosin.
As result the immune
system becomes weak, in old people.
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