BIOS 3430 Lecture Notes - Lecture 16: Gas Exchange, Peripheral Chemoreceptors, Active Transport
21 Nov 2016
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Document Summary
Understand how to calculate partial pressures in completely dry air (no water vapor pressure) as well as air with humidity at different temperatures. Fractional composition can change in confined spaces, due to biological processes (decay, respiration). Explain why carbon dioxide will dissolve more rapidly than oxygen to water, if both are at the same partial pressure. Colder the water the more soluble the gas in the water. H2o = 50x of air: diffusion rate (flux) H2o flows across well-vacularized lamellae in opposite direction of blood. Sheet flow: pblood increase, thickness of sheet decrease, diff resistance decrease. Why is ram ventilation more energy efficient: buccal pumping - floor of mouth raised and lowered. Water flows in mouth, through gills, out the operculum: ram ventilation - mouth open, swimming motion forces continuous flow across gills. Inspiration is active, expiration passive (at rest) recoil from intercostal muscles. During high activity: tidal volume increases and utilizes inspiratory.
