The human immune system
Chapter 1
First contact and the cellular border patrol
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Chapter 2
The specialized forces of adaptive memory
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Chapter 3
The ancient global quest to train our defenses
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Chapter 4
When defenses misfire or overreact
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YOUR GOAL
Master of The human immune system
Ch 1 · First contact and the cellular border patrol
Fun Fact
Innate defense speed: Your innate immune system responds to an injury or infection so fast that inflammation begins within seconds of the tissue being damaged.
Glossary
macrophage (noun)
A large white blood cell that engulfs and digests cellular debris, foreign substances, and microbes. These cells patrol human tissues, engulfing foreign pathogens immediately after they breach the skin barrier.
A large white blood cell that engulfs and digests cellular debris, foreign substances, and microbes. These cells patrol human tissues, engulfing foreign pathogens immediately after they breach the skin barrier.
Quiz
Which part of the brain controls body temperature and triggers a fever during an infection?
Quiz
Which enzyme found in human tears and saliva actively destroys bacterial cell walls?
Quiz
How many dead skin cells does a human typically shed every minute to help clear away microbes?
Quiz
What is the highly acidic pH range of human stomach acid that dissolves most ingested bacteria?