Tech in Surgery Prep / Unit 2 TSC 035 short lesson, about 20 seconds
The Body's First Defenses
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The idea
The body's first defenses are barriers that keep microbes out, flush them away or destroy them on arrival.
In practice
Intact skin keeps microbes out; mucous membranes trap them; stomach acid destroys many that are swallowed; cilia sweep mucus from the airways.
Where people slip
An incision, a burn or a cut breaks the skin barrier, creating a portal of entry the body did not have.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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