Question

What is difference between B and T cells?

Answer 1

B Cells:

1. B cells are responsible for humoral immunity.
2. The adaptive immunity manifested by the production of antibodies by B lymphocytes is known as humoral immunity.

T Cells:

1. T cells are responsible for cell-mediated immunity.
2. The immunity mediated by T-cells by directly attaching themselves to the antigens is known as cell-mediated immunity.

Difference between B and T cells:

B cells	T cells
1) B cells originate in the bone marrow.	1) T cells originate in the thymus.
2) B cells are also known as B lymphocytes.	2) T cells are also known as T lymphocytes.
3) Present outside lymph node.	3) Present inside lymph node.
4) Have surface antibodies.	4) Do not have surface antibodies.
5) Connect to the surface of invading bacteria and viruses.	5) Connect to the virus antigen on the outer side.
6) Membrane receptor for antigen is BCR (B cell receptor).	6) Membrane receptor for antigen is TCR (T cell receptor).
7) Life span is short.	7) Life span is long.
8) Secrete antibodies.	8) Secrete lymphokines.
9) Have only one active type.	9) Have two types: Helper and killer.