By trapping the germs in the air inside it so it doesn't get inside your body.
That's why its bad to pick your nose cause then you're getting all the germs on your fingers!
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The first line of defense.
The function of the first line of defense is to keep pathogens out of the body.
The Body's first line defense acts as physical barriers, in which it functions by trapping the pathogens and blocking them from entering the body. Also, all first line defenses act the same way to all pathogens, in which they're called non-specific defense.
skin
The Epidermis .
The body has three main lines of defense against pathogens. They are as follows:First line of defense: Skin, Mucous membranes, and Secretions of skin and mucous membranesSecond line of defense: Phagocytic white blood cells, Antimicrobial proteins, and the Inflammatory responseThird line of defense: Lymphocytes, and Antibodies
The first and biggest line of defense is the skin. This non-discriminatory barrier is also the largest organ of the human body.
The first line of defense.
skin and mucous membranes
skin and mucous membranes first line of defense second line-leukocytes and macrophages, inflammation and fever third is immune system
The function of the first line of defense is to keep pathogens out of the body.
The mucous membrane line all exterior openings to your body. Their main function is to protect your body from disease. That is mostly their only function except for being annoying.
The Body's first line defense acts as physical barriers, in which it functions by trapping the pathogens and blocking them from entering the body. Also, all first line defenses act the same way to all pathogens, in which they're called non-specific defense.
first
line and protect the inside of your body
Your body's third line of defense is specific defenses, such as the immune response.
It matters on which cavity of the body it is. For example, for the heart the membrane is the pericardium. Mucous membranes line body cavities that open to the outside. examples would be the nose, mouth, respiratory tract, and the anus.