T-lymphocytes

Question 1

name the two main types of lymphocytes

Answer 1

T cells
B cells

Question 2

what is humoral immunity?

Answer 2

a type of immune response that occurs when antigens are detected in the body.

Question 3

what is cell-mediated immunity?

Answer 3

a type of immune response that occurs when a cell is infected by a virus, bacteria or fungi and they detect antigen presenting cells.

Question 4

what is the role of T cells?

Answer 4

they are involved in cell-mediated response and detect antigen presenting cells.

Question 5

what is the role of B cells?

Answer 5

they are involved in humoral response and detect antibodies and antigens in blood and tissue fluid.

Question 6

what is an antigen?

Answer 6

a foreign protein that triggers an immune response

Question 7

give some examples of antigen presenting cells.

Answer 7

• phagocyte that has engulfed a pathogen.
• a body cell invaded by a pathogen.
• cancer cell.

Question 8

what are the two types of T cells?

Answer 8

T helper and T killer cells (cytotoxic)

Question 9

what is the role of T helper and T killer cells?

Answer 9

• the receptors on T helper cells attach to antigens on invaded cells., which stimulate B cells to divide and produce antibodies.
• killer cells cause holes to be made in the cell membrane meaning cells become more permeable to all substances.

Question 10

describe the role of T helper cells in cell-mediated immunity?

Answer 10

they stimulate B cells and cytotoxic cells to divide.