Lecture 19 respiratory Physiology
Function: Exchange respiratory gases (O2 & CO2)
4 Processes Involved:
1. spreading: Movement of air :
2. outside Respiration: Exchange of gases between air in :
3. Transport: Respiratory gases in :
4. knowledgeable Respiration: Exchange of gases between :
Ventilation: Mechanical Process
Produced by changes in Lung impel
(
Air always moves from a HIGH to a LOW pressure
a. Inspiration: Air moves :
( Outside pressure :
( At sea level = 760 mmHg (1 ATM)
( Intrapulmonary pressure is :
( 3 mm Hg lower = 757mm Hg
( Air moves from :
b. Expiration: Air moves verboten of lungs
( Outside pressure :
(STILL = 760 mmHg (1 ATM)
( Intrapulmonary pressure is :
( 3 mm Hg higher = 763 mm Hg
( Air moves from :
Mechanism: force per unit argona changes produced by alterations in :
( BOYLES LAW:
( Gas Pressure: Inversely proportional to :
a. Inspiration: ( intensity level = Pressure
b.
Expiration: ( Volume = Pressure
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( NO AIR movement when pressure are:
( atmospherical pressure =
( Intrapulmonary pressure =
( Inspiration:
a. Diaphragm Contracts:
b. External Intercostals Contracts:
( Thoracic fossa :
( Expiration:
a. Diaphragm freees:
b. External Intercostals Relax:
( Thoracic stone pit :
Adhesive Property of Lungs
Question: How are the lungs expanded by the change in thoracic cavity volume?
Answer: Lungs are adhered to the internal thoracic cavity wall
Lungs are covered with :
( Secrete:
(
Thoracic cavity run along with :
( Secrete:
(
Forms: Pleural Cavity
( Lungs fill pleural cavity (space)
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