BIO202H5 Lecture Notes - Lecture 2: Semipermeable Membrane, Perfusion, Osmosis
Document Summary
Bio202: lecture 2: january 14, 2019: gas exchange. Energy obtained by oxidation of food: oxidizing food to metabolize and make energy. Oxygen is abundant in air and dissolved in water: need it to sustain life/ have metabolic processes. Diffusion: diffusion: spontaneous movement of particles from areas of high to low concentration, osmosis: diffusion across a semi-permeable membrane, o2 in water. Lower diffusion rates and solubility: diffusion rates are lower in water. Fick"s law: uses to describe diffusion rate. [o2] is proportional to po2 (partial o2) at a constant temperature (amount of o2that dissolves in liquid is determined by po2 and solubility of liquid: want x to be lower. Limitations of external respiration: external respiration, ventilation active movement of respiratory medium, how you are using the o2 pumped to go into the body, perfusion gas uptake, how do we get the o2 across.
