BIOLOGY NOW WITH PHYSIOLOGY + THE STORY
2nd Edition
ISBN: 9780393430479
Author: HOUTMAN
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Chapter 25, Problem 5TQ
Summary Introduction
The immune system has three layers of defenses and they protect the body from pathogens. The first layer of defense is composed of external defenses, the second line of defense is known as the innate immune system, and the third line of defense is known as an adaptive immune system. The innate immune system reacts to foreign particles or cells while entering into the body. The innate immune response can be local (at a specific site) or global (whole body).
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