Non Specific Immunity FINAL LECTURE EXAM

1. 🟢 Innate immunity (1st & 2nd line)

🔑 Key features:

• You were born with it

• Works immediately (fast)

• Non-specific → treats all germs the same

• No antigen recognition

• No antibodies or memory

📍 1st line of defense (keeps germs OUT)

👉 Physical barriers

Examples:

• Skin

• Mucus

• Tears

Simple idea:
➡ “Block germs from entering”

📍 2nd line of defense (if germs get in)

👉 Internal defenses

Examples:

• Inflammation

• Fever

• White blood cells

Simple idea:
➡ “Attack any germ the same way”

👉 Fast, general, no memory

🔵 2. Adaptive immunity (3rd line)

🔑 Key features:

• Specific → targets a particular antigen

• Learns and adapts

• Recognizes antigen

• Produces antibody

• Creates memory cells

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⏳ Speed:

• Slower at first

• MUCH faster the second time (because of memory)

🔵 2. Adaptive immunity (3rd line)

🧠 What it does:

1. Detects a specific antigen

2. Activates immune system

3. Makes antibodies

4. Creates memory

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🧠 Summary for adaptive:

👉 Specific, slower, has memory

innate vs adaptive

Feature	Innate (1st & 2nd line)	Adaptive (3rd line)
Specific?	No	Yes
Speed	Fast	Slow (first time)
Memory	No	Yes
Antibodies	No	Yes
Present at birth	Yes	Develops over time

👉 Innate = general, fast, no memory
👉 Adaptive = specific, slower, has memory

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🧠 Memory trick:

👉 “Innate = in-born, Adaptive = adapts and remembers”