This is one of the two main types of white blood cells that is an essential parts of the immune system and directly attacks antigens. it is produced in bone marrow, matures in the thymus, and travels in the blood to other tissues, such as the spleen, tonsils, and lymph nodes.

T cell

Explanation:

They were named T-cells mainly due to the presence of T-cell receptor on the cell surface. They are two main types of T cells. Helper-T cells that mark cells for destruction while the other is T- cytotoxic that induce apoptosis (cell death) in cells. The other type of T cells is the regulatory T cell that regulates autoimmune response.

the answer is b. glad to .

1. b.

2. d.

3. a.

5. d.

6. c.

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