Non-Specific Defence systems

Question 1

What is the job of a non-specific defence systems?

Answer 1

• Prevent pathogens from entering the human body.l

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Question 2

What is the skin?

Answer 2

• Forms a protective layer covering the body.
• Outer layer of skin: Consists of dead cells: Difficult for pathogens to penetrate.
• Produces an oily substance called sebum which can kill bacteria.

Question 3

What happens when the skin is damaged?

Answer 3

• Could allow pathogens to enter the body.

- To stop this: Skin scabs over,

Question 4

What does the nose do?

Answer 4

• Contains hair + Mucus.
• ## Trap Pathogens before entering breathing system.

Question 5

What does the lungs do?

Answer 5

• Trachea and the Bronchi are covered in tiny hairs called cillia.
• Covered in mucus to trap pathogens.
• Cillia waft the mucus towards the throat where it is swallowed by the stomach.

Question 6

What does hydrochloric acid do?

Answer 6

• Kills pathogens before they make their way further down into the digestive system.
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