In Children Born Without a Thymus, Which Would Be the Most

Question

In children born without a thymus, which would be the most serious symptom?
A)A very low population of B lymphocytes.
B)A very low population of T lymphocytes.
C)Elephantiasis of the lower limbs.
D)Poor lymphatic return from the left arm.

Accepted Answer

The thymus is responsible for the development of T lymphocytes, which are important for cell-mediated immunity. Without a thymus, there would be a very low population of T lymphocytes, leading to a compromised immune system and susceptibility to infections. A low population of B lymphocytes would also be a concern but not as serious as a low population of T lymphocytes. Elephantiasis and poor lymphatic return from the left arm are not related to the absence of a thymus.