Question

The first line of defence in our body is formed by?

Answer 1

Answer:

$\bullet$The protective mechanical/physical barriers forms the first line of defence in our body.

$\bullet$ That is, the skin and the mucous membrane linings of the respiratory, gastrointestinal, and genitourinary tracts provide the first line of defense against invasion by microbes or parasites.

$\bullet$ The skin forms the outer, tough layer of the body and is impenetrable to germs.

$\bullet$Hair, like those present in nostrils and eyelashes, trap dust particles and prevent their entry.

$\bullet$The mucus secreted in nasal passage and windpipe trap germs like bacteria and prevent their entry inside. Cilia of the windpipe then remove the trapped bacteria.