20 Rs Aveolar Ventilation

20 Rs Aveolar - ALVEOLAR GAS EXCHANGE Page 1 ALVEOLAR-CAPILLARY EXCHANGE A Mechanism 1 Simple diffusion through tissue and fluids B Characteristics

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ALVEOLAR GAS EXCHANGE AC Brown Page 1 A7c ALVEOLAR-CAPILLARY EXCHANGE A. Mechanism 1. Simple diffusion through tissue and fluids B. Characteristics of Alveolar-Capillary Diffusion 1. Driving force: partial pressure difference between alveoli and pulmonary capillary blood for each gas 2. Rate of diffusion: Product of driving force and ease of diffusion 3. Gases diffuse independently, according to each gas’s partial pressure difference and ease of diffusion 4. Ease of diffusion depends on a. Area: the alveolar area available for diffusion (i.e., in contact with pulmonary capillary blood) is very large (order of 70 m 2 ) Note effect of degenerative lung disease Note effect of pulmonary embolism b. Distance: even though gas must pass through several compartments, all are normally thin (even interstitial space), so total diffusion distance is small Note effect of pulmonary edema
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ALVEOLAR GAS EXCHANGE AC Brown Page 2 A7c ALVEOLAR-CAPILLARY EXCHANGE (continued) B. 4. Ease of diffusion (continued) c. Diffusion Coefficient: depends on molecular weight of the gas (not normally a major factor) and its water solubility
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/03/2012 for the course BIO 308 taught by Professor Acbrown during the Spring '10 term at Portland.

Page1 / 4

20 Rs Aveolar - ALVEOLAR GAS EXCHANGE Page 1 ALVEOLAR-CAPILLARY EXCHANGE A Mechanism 1 Simple diffusion through tissue and fluids B Characteristics

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online