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8:07
Khan Academy
Sal Khan
Types of immune responses: Innate and adaptive, humoral vs. cell-mediated
The immune system is divided into nonspecific (innate) and specific (adaptive) responses. Nonspecific defenses, like skin and stomach acid, block pathogens indiscriminately. Specific defenses, such as B and T lymphocytes, adapt to specific pathogens after exposure. B lymphocytes are part of the humoral response, dealing with pathogens in body ...
Feb 20, 2011
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