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This Concept Map, created with IHMC CmapTools, has information related to: Respiratory system, carbonic acid which eventually reaches Alveoli of lung (capillary rich elastic sacs), Tracheae (in insects) have openings called spiracles, bronchi (two tubes) then bronchioles (smaller tubes), CO2 diffuses into blood where carbonic anhydrase (found in erythrocytes), The Respiratory System in humans, starts with the Nose (air is filtered), The Respiratory System can be Tracheae (in insects), Lungs (cavities within animals) in humans are controlled by diaphragm and intercoastal muscles, The Respiratory System can be Lungs (cavities within animals), the trachea is protected from food/liquid by Epiglottis, to tissues then CO2 diffuses into blood, Gills have countercurrent exchange, due to high CO2 or lactic acid hemoglobin releases O2 to tissues, Alveoli of lung (capillary rich elastic sacs) where O2 diffuses in, O2 diffuses in where it binds to hemoglobin, Gills have operculum (protective flap), the trachea then bronchi (two tubes), binds to hemoglobin when pH decreases due to high CO2 or lactic acid, pharynx then larynx (voice box) then enters the trachea, Nose (air is filtered) goes to the pharynx then larynx (voice box), The Respiratory System can be The skin (i.e. earthworms)