BIOL 2420 Lecture 36: Human Physiology 2 BIOL 2420-36
Document Summary
Unit 5: immune system (c: the innate immune system: They"re produced from the bottom up, so we shed the uppermost layers as new layers are being made. It"s very dry, which desiccates bacteria: skin infections are more common on moist areas of the skin. It is found in sweat, tears, saliva and nasal secretions: the normal microflora, this occurs shortly after birth. It functions to prevent the growth of pathogens (because there"s no space for the pathogen to occupy within the body) This occurs because of the competitive exclusion (normal microflora take up space and food) an microbial antagonism (normal microflora kill off the competitors) The more normal microflora there is, the less space and nutrient available for the pathogens: phagocytosis, monocytes and granulocytes (neutrophils) migrate to the infected area through capillary pores, 4 phases, chemotaxis: Phagocytes are attracted to foreign particles, damaged cells: adherence. Phagocytes attaches to the foreign material (to the pamps)