BIOL273 : Unit 5 Respiratory System.docx

• School: University of Waterloo
• Department: Biology
• Course: BIOL273
• Professor: Catherine Studholme

Document Summary

Unit 5 respiratory system: structure & function of the respiratory system (pg 569-576) Multicellular organism need a specialized respiratory organ coupled with the circulatory system. Respiratory system allows for: exchange of gases between atmosphere and blood, homeostatic regulation of ph regulate co2 release, protection from inhaled pathogens & irritating substances (trapped in mucous, vocalization. Gas exchange between atmosphere and lungs (ventilation) Inspiration air moves into lungs (inhalation) (forced: expiration air moves out of lungs (exhalation) (forced during heavy breathing) Gas exchange between lungs and blood (co2 and o2) figure 17-1. Transport of gases by blood (co2 and o2) Exchange of gases between blood & tissues. Refer to figure 18. 1 on pg 600. Cellular respiration intracellular reaction of oxygen with organic molecules to produce co2, h2o, and atp. External respiration movement of gases between environment and body"s cells. Bones & muscles of thorax pumping system (abdominal muscles & intercostal)