BIO 26 Lab Exam

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Three main lines of defense
- 1. Surface barriers
- 2. Innate internal defenses
- 3. Adaptive defenses
Surface areas - think castle walls and moat
- Castle walls - Epithelium
- Moat - mucus secretion
Innate external defenses
Innate internal defenses - think guards

check I D and and are always ready to attack foe: cells and chemicals in body fluids
Adaptive defenses - think army

take time to mobilize and train to fight an identified enemy: B and T cells
Adaptive immunity differs from innate in four different ways - think guards and army
- 1. are specific - they are directed against a specific enemy
- 2. involve the BaTTalion - B and T cells
- 3. they have memory - will attack the same enemy who comes back to do battle again
- 4. are systemic - they can work anywhere in the castle/moat/walls - systemic