T-lymphocytes

Have three main types - cytotoxic, helper and suppressor cells

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Are produced in the thyroid

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Originate in lymphoid tissue

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Scavenge damaged cells and cellular debris

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Solution

The correct option is A Have three main types - cytotoxic, helper and suppressor cells
T-lymphocytes are a type of lymphocytes (which are a type of white blood cells) that play a major role in cell-mediated immunity. They are known as T cells because they mature in the thymus. They are of 3 main types - cytotoxic, helper and suppressor cells, each having their own distinct functions.

Suggest Corrections

Column I	Column II
A. Helper T cells	1. Directly attack and kill a cell
B. Cytotoxic T cells	2. Prevent attacking own cell
C. Suppressor T cells	3. Prevent exaggerated immune response
D. T delayed hypersensitivity cells	4. Activation of B cells