Question

Write short notes on the following:
Primary immunity

Answer 1

Primary Immunity.
Primary immunity, also known as innate immunity, is the first line of defense against pathogens. It is a nonspecific response, meaning it does not target specific pathogens but acts against any foreign invader. The components of primary immunity include:
1. Physical barriers: The skin, mucous membranes, and cilia prevent the entry of pathogens.
2. Chemical barriers: Enzymes, stomach acid, and antimicrobial peptides help kill or neutralize harmful invaders.
3. Cellular defenses: White blood cells like neutrophils and macrophages engulf and destroy pathogens through phagocytosis.
Conclusion.
Primary immunity provides immediate, nonspecific protection from infections.