What is the first line of defense in the immune system?

What is the first line of defense in the immune system?

Step 1: Understand that the immune system protects the body from harmful germs called pathogens.
Step 2: Identify what the first line of defense means; it refers to the body's initial protection against these pathogens.
Step 3: Recognize that physical barriers are the main components of this first line of defense.
Step 4: Learn that the skin acts as a protective barrier, preventing pathogens from entering the body.
Step 5: Know that mucous membranes, found in areas like the nose and mouth, also help trap and eliminate pathogens.

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