1. Skin: The skin acts as a physical barrier, preventing pathogens from entering the body. It also produces sebum, a substance that contains antimicrobial properties.

2. Mucous Membranes: These line various parts of the body such as the nose, mouth, and lungs. They produce mucus, a sticky substance that can trap pathogens. Some mucous membranes also have cilia, tiny hair-like structures that can move mucus and pathogens out of the body.

3. Saliva and Tears: Both of these fluids contain enzymes that can break down the cell walls of many bacteria, effectively killing them.

4. Stomach Acid: The highly acidic environment in the stomach can kill many pathogens that enter the body via the mouth with food or drink.

Question

1. Skin: The skin acts as a physical barrier, preventing pathogens from entering the body. It also produces sebum, a substance that contains antimicrobial properties.

2. Mucous Membranes: These line various parts of the body such as the nose, mouth, and lungs. They produce mucus, a sticky substance that can trap pathogens. Some mucous membranes also have cilia, tiny hair-like structures that can move mucus and pathogens out of the body.

3. Saliva and Tears: Both of these fluids contain enzymes that can break down the cell walls of many bacteria, effectively killing them.

4. Stomach Acid: The highly acidic environment in the stomach can kill many pathogens that enter the body via the mouth with food or drink.

Knowee AI · Accepted Answer

1. Skin: The skin acts as a physical barrier, preventing pathogens from entering the body. It also produces sebum, a substance that contains antimicrobial properties.

2. Mucous Membranes: These line various parts of the body such as the nose, mouth, and lungs. They produce mucus, a sticky substance that can trap pathogens. Some mucous membranes also have cilia, tiny hair-like structures that can move mucus and pathogens out of the body.

3. Saliva and Tears: Both of these fluids contain enzymes that can break down the cell walls of many bacteria, effectively killing them.

4. Stomach Acid: The highly acidic environment in the stomach can kill many pathogens that enter the body via the mouth with food or drink.

List four (4) external methods of protecting the body from infection.

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