Measurement of breathing Flashcards
Ventilation
movement of gas from environment to gas exchage space
What does movement of gas require
Driving force
Source and sink of oxygen
Source: environment
Sink: Mitochondria
Source and sink of CO2
Source: mitochondria
Sink: environment
Law of partial pressures
Total pressure= sum of all other pressures
Dalton’s law
Partial pressure of gas= total pressure of gas X fractional concentration of the gas
Water vapor correction
Partial pressure of lung air= (total pressure of gas- water from lung [47]) X fractional concentration of the gas
Henery’s law
Volume of gas dissolved in liquid is proportional to partial pressure
C= k[constant] X partial pressure
Where is P02 lowest
Mitochondria
Fick’s law of diffusion
Rate molecules move through membrane to reach equilibrium
J= D x A x a x (C1-C2)/ X
External intercostal muscles
Inspiration
Internal intercostal muscles
Expiration
Total air in
Tidal volume= Vt
Minute ventilation
How much air in and out per minute= Ve= Vt x frequency
What is the alveolar pressure at rest
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