Question

Read the following passage and answer the questions:

Our body has a defence system to protect against invading microbes. The outermost line of defence is the barrier that prevents the entry of microbes into the body, and if they enter, phagocytic cells kill the microbes. This forms the local defence system of the body. The innermost line of defence includes the formation of specific antibodies that combine with the antigen (microbe) and then destroy it. This is called specific immunity.

What are the mechanical barriers that prevent microbial entry into our body?

Answer 1

Mechanical barriers:

1. Mechanical barriers are the first line of defence of our body against invading microbes
2. They physically block these microbes from entering our bodies.
3. The skin is the most important mechanical barrier.
4. Other than the skin, even mucous membrane acts as a mechanical barrier.
5. Other examples include tears and urine.