Pleural fluid produced by pleural membranes acts as lubricant -Helps hold parietal and visceral pleural membranes together 12
12 •Pleural fluid produced by pleural membranes –Acts as lubricant –Helps hold parietal and visceral pleural membranes together
I. Alveolar Pressure Changes During respiration
13 I. Alveolar Pressure Changes During Respiration
Principles of Breathing Functional Unit: Chest Wall and Lung Follows Boyles Law Pressure(P)x Volume(V)=Constant Conducting A Irwa ys Pleural Cavity Lungs Very small space Gas Exchange Maintained at negative pressure Transmits pressure changes Allows lung and ribs to slide Chest Wall (muscle, ribs) Diaphragm Pleural cavit (muscle) Imaginary Space between Lungs and chest wall
14 Chest Wall (muscle, ribs) Principles of Breathing Functional Unit: Chest Wall and Lung Conducting Airways Diaphragm (muscle) Lungs Gas Exchange Follows Boyle’s Law: Pressure (P) x Volume (V) = Constant Pleural Cavity Imaginary Space between Lungs and chest wall Pleural Cavity Very small space Maintained at negative pressure Transmits pressure changes Allows lung and ribs to slide
Principle of Breathing Follows Boyle's Law PVa( At Rest with mouth open Pb= Pi=0 Airway Open CW
15 CW Follows Boyle’s Law: PV= C At Rest with mouth open Pb = Pi = 0 D Pi A PS Pb Airway Open Principle of Breathing 1
Principle of Breathing Follows Boyle's Law PVa( At Rest with mouth open Pb= Pi=0 Inhalation. Increase Volume of Rib cage Airway Open Decrease the pleural cavity pressure Decrease in Pressure inside(pi igs D CW PS 16
16 CW Follows Boyle’s Law: PV= C At Rest with mouth open Pb = Pi = 0 Inhalation: - Increase Volume of Rib cage - Decrease the pleural cavity pressure - Decrease in Pressure inside (Pi) lungs D Pi A PS Pb Airway Open Principle of Breathing 2