BIO202H5 Lecture Notes - Lecture 2: Perfusion, Bronchus, Pus
Document Summary
Lecture 2: gas exchange (1) sustaining aquatic life. Low oxygen diffusion rates in water properties of fluid determine rate. Less available oxygen in a given volume of fluid need more energy to o o run an oxygen pump o. Breathing is more expensive in water generally because rate of diffusion is less effective. Inverse relationship between water temperature and gas saturation. Warmer water becomes more readily saturated with oxygen and can hold less of dissolved gas o. Higher temperatures favour high metabolic activity and greater oxygen demands o. Amount of oxygen is reduced in salt water (2) fick"s law and respiration. Ventilation active movement of respiratory medium trying to increase pressure gradient between you and environment. Diffusion rate more favourable when area is large as much area as possible for oxygen to cross. Can maximize planar area by introducing folds on ventilatory surface. Diffusion rate is favourable when l is small (l= thickness of barrier oxygen needs to cross)
