Biology 1201A Lecture Notes - Lecture 22: Osmotic Pressure, Chemokine, Haematopoiesis

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Disease has plagued all organisms for billions of years. Humans evolved out of africa 200,00 years ago: aids affects 40 million people, malaria affects 500 million people, and the world population is just over 7 billion. Pathogens: an agent causing disease, usually a living microorganism capable of producing infection, such as: viruses, fungi, bacteria, parasites, protozoa, and protein. I. e. the collective name for the organs, tissues, and cells of the body. 3 lines of defense against invasion: physical barrier. Inherited mechanisms that protect the body in a nonspecific mechanism. * reaction to infection takes minutes: adaptive (or acquired) immune system. Not born with it but you develop it, (whether you were you breast fed or not, had chicken pox, malaria etc. ) Inherited mechanisms that lead to the synthesis of antibodies. How you make the antibodies depends on what you have been exposed to. *reaction to infection takes several days: physical barrier.

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