PSL201Y1 Chapter Notes - Chapter 16: Alveolar Cells, Respiratory Tract, Alveolar Pressure
Document Summary
Pulmonary ventilation is the movement of air into and out of the lungs. Internal (cellular) respiration: use of o2 within mitochondria to generate atp by oxidative phosphorylation. External respiration: exchange of o2 and co2 between atmosphere and body tissues. Encompasses 4 processes: pulmonary ventilation, gas exchange between lung air spaces and blood through diffusion, transportation of o2 and co2 between lungs and body tissues by blood, gas exchange between blood and tissues by diffusion. The respiratory system has many functions other than respiration: Contributing to the regulation of acid-base balance in blood. Participating in defense against pathogens and foreign particles in airways. Providing a route for water and heat losses. Refers to air passages in head and neck. Air enters nasal and/or oral cavity which leads to pharynx (common passageway for food/air) Food enters esophagus which leads to stomach, air enters larynx. Acute occlusion in upper airways may result from choking, chronic occlusion may result from diseases like sleep apnea.
