Question

In which one of the following options the two examples are correctly matched with their particular type of immunity?

• A. Examples - Saliva in mouth and tears in eyes
  Type of immunity - Physical barriers
• B. Examples - Mucus coating of epithelium lining the urinogenital tract and the HCl in stomach
  Type of immunity - Physiological barriers
• C. Examples - Polymorphonuclear leukocytes and monocytes
  Type of immunity - Cellular barriers
• D. Examples - Anti-tetanus and anti-snake bite injections
  Type of immunity - Active immunity

Answer 1

The correct option is C Examples - Polymorphonuclear leukocytes and monocytes

Type of immunity - Cellular barriers
Phagocytosis is an important feature of cellular innate immunity performed by cells called phagocytes that engulf or eat pathogens or foreign particles. Common examples of these phagocytes are polymorphonuclear leukocytes, tissue dendritic cells, mast cells, etc.
Saliva in mouth and tears in eyes are examples of the physiological barriers of the innate immunity whereas the mucus coating of epithelium lining the urinogenital tract and the HCl in stomach act as a physical barrier.
Anti-tetanus and anti-snake bite injections are examples of passive immunity.