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?

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

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

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

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

What is another name for the nonspecific response?

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