Non-specific Defence Systems Flashcards

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Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

What are non-specific defence systems?

Non-specific defence systems are physical and chemical barriers that prevent pathogens from entering the body. They do not target specific types of pathogens.

How does the skin protect the body from pathogens?

The skin acts as a physical barrier and secretes an oily substance called sebum that can kill pathogens. When damaged, it forms scabs to prevent pathogens from entering.

How does the nose prevent pathogens from entering the body?

The nose produces mucus to trap pathogens and has hairs that filter out particles. Blowing the nose expels both mucus and trapped pathogens.

What role do the trachea and bronchi play in defence?

The trachea, bronchi and bronchioles are lined with mucus to trap pathogens. Cilia move the mucus and trapped pathogens to the throat, where they can be swallowed and digested in the stomach.

How does the stomach protect the body from pathogens?

The stomach contains hydrochloric acid, creating an acidic environment that kills pathogens before they can move further into the digestive system.

What is the role of lysozymes in tears?

Lysozymes in tears protect against bacteria by breaking down their cell walls, providing a chemical defence for the eyes.

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