Question

Which of the following is a physiological barrier in innate immunity

• A. Skin
• B. Stomach acid
• C. Mucus on respiratory tract
• D. Saliva

Answer 1

Answer: (B), (D)

The correct options are
B Stomach acid
D Saliva

Innate immunity consists of non-specific defense mechanisms. These mechanisms are inherently built into the human body and are generally effective against a wide range of disease-causing organisms. Skin and mucus on the respiratory tract are physical barriers. The human body also produces secretions like stomach acids, tears these are the physiological barriers which have antibacterial properties against the microbes.