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28 Immune system - Biology141(Physiology 1:15 AM...

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4/6/08 1:15 AM Biology141 (Physiology) Page 1 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2028(2008).htm Biology141 (Physiology) Lecture 28 M. Whim THE IMMUNE SYSTEM. [1]. BACKGROUND. what is the function of the immune system? the immune system defenses used by the body can be split into 2 categories: (a). Innate immunity. also called “non-specific immunity” does not depend on prior exposure to a pathogen. used to resist categories of pathogens (e.g. gram-negative bacteria). (b). Adaptive immunity. also called “specific immunity”. how does this differ from non-specific immunity? What cells are involved? (c). What happens when pathogens are encountered? e.g. bacteria cross the skin how does the body respond? Which defenses are activated? innate immunity involves several lines of defense: [2]. INNATE IMMUNITY. (a). External barriers. the skin mechanically prevents intrusion of most pathogens. what other features does the skin have that prevent infection?
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4/6/08 1:15 AM Biology141 (Physiology) Page 2 of 4 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2028(2008).htm
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