Three lines of defence in the immunity

How many lines of defences are there in our immune system?

• Four
• Three
• Two
• Five

What is immunity?

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What are the two types of barriers in the first line of defence in immunity?

• Environmental barriers

• Mechanical barriers

• Physical barriers

• Chemical barriers

What belongs to the physical barrier of the first line of defence?

• Hair and nails
• Skin and mucous membranes
• Bones and muscles
• Blood and lymph

What belongs to the chemical barrier of the first line of defence?

• White blood cells
• Bacterial cell walls
• Skin and mucous membranes
• Antimicrobial peptides and enzymes

Describe some features of nonspecific resistance

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Name some reactions of the body in the second line of defence to defeat pathogens

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Identify some types of cells involved in the third line of defence

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Identify some types of cells involved in the third line of defence

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What is another name for the nonspecific response?

• Innate immune response
• Cell-mediated immunity
• Specific immune response
• Adaptive immune response