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First Line of Defense Prevent Entry

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Presentation on theme: "First Line of Defense Prevent Entry"— Presentation transcript:

1 First Line of Defense Prevent Entry

2 1st Line of Defense (Non-specific) Skin - Fortress or Gate
In order for a pathogen to invade our body, it must first breach our skin.

3 Skin Epidermis - outer layer of skin. Constantly sloughs off and prevents bacteria from colonizing Sweat and oils contain anti-microbial chemicals

4 1st Line of Defense (Non-specific) Mucus & Cilia
Mucus contains enzymes that destroy bacterial cell walls Cilia moves mucus with trapped pathogens out of body

5 1st Line of Defense (Non-specific) Saliva
Saliva contains chemicals that break down and destroy pathogens

6 1st Line of Defense (Non-specific) Stomach Acid
Stomach Acid breaks down swallowed pathogens The stomach is lined with a special mucus to prevent damage

7 YouTube The Immune System

8 Stop Here

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