Question

list below the innate defense system. Clearly identify the three different barriers.

First Line of Defense:

1. Barriers

• Physical
• Mechanical
• Chemical

Answer 1

Physical barriers- skin acts as physical barrier as its outer layer stratum germinativum prevent entry of bacteria and virus.

Mechanical barreir - Mucous membrane secretes mucous mucus which trap micribes an.d immmobilize them.

Chemical barries - secretions of sweat, saliva, tear etc. contains lysozyme enzyme that prevent bacterial infection by destroying bacterial cell wall.

First LIne of Defence -

1. Epidermis of skin

2. Mucous membrane

3. Nasal hairs

4. saliva

5. cilia

6. sebum

7. lysozyme

8. gastric juice

9. vaginal secretions

Thanks