Question

The letter T in T – Lymphocyte refers to –
A. Thymus
B. Thyroid
C. Thalamus
D. Tonsil

Answer 1

Hint:The letter before the word lymphocyte refers to the place of maturation of the lymphocytes. T means that the cell matures in the thymus. B means that the cell matures in the bone marrow.

Complete answer: The lymphocytes are a type of White Blood Cells that have a very important role in fighting foreign particles. T cells are a type of lymphocyte.
They originate from hematopoietic stem cells found in the bone marrow. The lymphocytes leave the bone marrow and migrate to the thymus gland for maturation. Therefore, they get their name, T – lymphocytes.
The T – lymphocytes play a pivotal role in the immune response. They can be distinguished from other lymphocytes due to the presence of a T-cell receptor on the cell surface. They originate as precursor cells which are derived from the bone marrow. Then, they develop into several distinct types of T cells after migrating to the thymus gland. Their differentiation continues even after they leave the thymus.

So, the answer is option A.

Additional information:
T-cells are grouped into a series of groups based on their functions. The CD4 and CD8 T cells are differentiated in the thymus. The T- lymphocytes play a pivotal role in the cell-mediated immune response.
They are divided into the following groups –
T – helper cells
T – memory cells
T – cytotoxic cells
T – regulatory cells

Note:The T – lymphocytes are an important part of the cell-mediated immune response. They are formed in the bone marrow and get matured in the thymus. The B - lymphocytes are formed and get matured in the bone marrow.