Q. To which type of barriers under innate immunity, do the saliva in the mouth and the tears from the eyes belong?
(a) Cellular barriers
(b) Physiological barriers
(c) Physical barriers
(d) Cytokine barriers
Solution : Correct option : D The immune system provides both the types of immune response innate and acquired immune responses. Innate immunity occurs naturally due to genetic factors or physiology. It is a native immune response that present by birth. It provides physical barrier such as skin, Physiological barriers such as pH of the stomach, bile juice, saliva and tears, cellular barriers such as leucocytes, macrophage cell and cytokine barrier.