Question

In the human body, which of the following is considered an external defense in the prevention of disease?

Answer 1

it is skin in my opinion. it is part of innate immuty as mechanical barrier

Answer 2

Explanation:

There are some external defense parts which prevent to enter disease in our body.

Skin is the first one which protects physical entry of the viruses and bacteria enters into the body. Skin is not always perfectly works as a protector but sometimes it protects our body from the damages. If anyone hurt externally and starts to bleed then skin arrange to create blockage of the bleeding place by collecting platelets to protect the body.