Which of the following immunity is called the first line of defence? a. Innate Immunity b. Active immunity c. Passive immunity d. Acquired immunity

Here are the answers to the questions:

31. Which of the following immunity is called the first line of defence?
A. Innate Immunity

Innate immunity is the body's non-specific, immediate defense system, acting as the first line of defense against pathogens.

32. Which of the following cells is involved in cell mediated immunity?
A. T-cells

T-cells are the primary cells responsible for cell-mediated immunity, directly attacking infected cells or regulating other immune cells.

33. Cells Involved In Innate Immunity are_____
D. All of the above

Phagocytes (which include macrophages) and Natural Killer Cells are all key components of the innate immune system, providing immediate, non-specific defense.

34. What is a blood group?
C. A set of erythrocyte antigens

A blood group is determined by the specific antigens present on the surface of red blood cells (erythrocytes).

35. What is the name of the antigen-antibody reaction in determining the Rh factor of blood?
C. Isoagglutination

Isoagglutination refers to the agglutination (clumping) of red blood cells caused by antibodies from the same species, which is the principle used in blood typing, including for the Rh factor.