PSL201Y1 Lecture Notes - Lecture 18: Circulatory System, Pulmonary Artery, Intrapleural Pressure
Document Summary
Respiratory system 1: overview and ventilation (textbook: pages 449-461) What are the functions of the respiratory system: exchange of oxygen and carbon dioxide between the atmosphere and body tissues, helping to regulate ph of the blood, enabling vocalization. Air passes over vocal chords and allows singing and speaking: defense against pathogens and foreign particles. What is does the term respiration mean: external respiration. Exchange of oxygen and carbon dioxide between atmosphere and body tissues. Where you take oxygen, and make atp. What are the structures that make up the respiratory system: upper airways, respiratory tract, structures of the thoracic cavity. Conducting zone cartilage at first then slowly disappears. breathe in air-it gets warmed and humidified and filtered. almost microscopic (where you have gas exchange b/c walls are thin here) Filtering action of cilia that line the airway. Alveolus type 1 cells make up wall surrounding it. Type ii cells secrete surfactant (prevents alveoli from collapsing) very thin walls.
