Question

Write short notes on Physical barrier and Cellular barrier.

Hint:

Remember: Physical barriers (skin, mucous) block entry; cellular barriers (WBCs) fight infections.

Answer 1

1.Physical barriers include skin and mucous membranes that prevent the entry of pathogens.
2.Cellular barriers include phagocytic cells like neutrophils and macrophages that engulf pathogens.
3.Physical barriers such as skin and mucous prevent pathogen entry by acting as the first line of defense. Cellular barriers include immune cells that identify and destroy pathogens by engulfing them.