Question

Which one of the following statements is correct about T-lymphocytes in mammals?

• A. These are produced in the thyroid
• B. These are originated in lymphoid tissues
• C. They scavenge damaged cells and cellular debris
• D. There are three main types – cytotoxic T-cells, helper T-cells and suppressor T-cells

Answer 1

Answer:

B. These are originated in lymphoid tissues

• T cells (also called T lymphocytes) are one of the major components of the adaptive immune system.

• Their roles include directly killing infected host cells, activating other immune cells, producing cytokines and regulating the immune response.