HLTB22H3 Lecture Notes - Lecture 4: Respiratory System, Paracrine Signalling, Beta Cell
Document Summary
Example of interaction between you and external environment: gastrointestinal tract. Respiratory system brings in air, and with air pathogens. Body will try to maintain your internal environment, to keep it separate from the. Pathogens activate the immune response. Viruses, bacteria, fungi, etc. They all require different strategies to fight them. Second line of defense innate immune system. Takes out basically anything it can; it will go after one and forget about the rest. Process by phagocytes take in material and destroy it. Material can or cannot be disease causing. Classification of a cell. Phagocytes are determined by if they"re primary method of removing pathogens is by taking it up and then destroying it. Swelling (edema): permeable blood vessels. Redness: increased blood flow. Heat: increased blood flow. Pain: edema, bradykinins: phagocyotosis: will ingest anything that needs to be taken us, example: pathogen, cellular debris, etc. Protective measures are in place to make sure its activity is controlled.
