BIOA02H3 Lecture Notes - Lecture 17: Trachea, Hypocapnia, Air Sacs

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Ivana Stehlik

Document Summary

Bioa02h3 lecture 6 (module 2): respiratory systems and breathing. Partial pressure of gases: partial pressure of a gas (pgas): the pressure exerted by a given gas within a gas within, composition of air: 78% nitrogen; 21% oxygen; 0. 03% carbon dioxide; 0. 97% rare. Gases: normoxia: normal inspired o2; normocapnia: normal inspired co2, hypoxia: decreased inspired o2; hypocapnia: decreased inspired co2, hyperopia: increased inspired o2; hypercapnia: increased inspired co2. External gills: tentacles: gas exchange and feeding, water is pumped in and out of the tube, gills are exposed to the water and can be oved around, oxygen diffuses across the gills into the blood. Internal gills: aquatic invertebrates: squid: ventilation by muscular contraction; water sucked into the mantle cavity and then forced out of a funnel. Lobster: gills arise from the base of the legs: scaphognathite propels water through a posterior opening. Water flows across the gills and then out of an anterior opening.