FACTORS THAT INFLUENCE PULMONARY VENTILATION

FACTORS THAT INFLUENCE PULMONARY VENTILATION - . FACTORS...

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. FACTORS THAT INFLUENCE PULMONARY VENTILATION A. Airway Resistance -this includes friction or drag encountered in the respiratory passageways. 1. F = P/R where F is airflow, P is pressure and R is resistance. 2. On average, we move about 55 ml of air in and out of the lungs with each breath. 3. Normally, airway resistance is reasonably low because: a. Airway diameters are large (relatively speaking). b. Gas flow stops at the terminal bronchioles and diffusion takes over as the force that controls gas movement 4. What is an acute asthma attack? B. Alveolar Surface Tension -created where air meets blood. This is produced due to the stronger attraction of liquid molecules for each other compared to the attraction between the gas and air. 1. This leads to cohesion between the liquid molecules and it increases the surface area of the liquid. This cohesion between water molecules can create enough stress to collapse alveoli. 2. Surfactant
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FACTORS THAT INFLUENCE PULMONARY VENTILATION - . FACTORS...

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