LIFESCI 7C Lecture 9: LS 7C Week 4 lecture 1
Document Summary
Gas in lungs flow from high to low partial pressure down a pressure gradient. (co2 leaves blood while. Red blood cells carry o2 and is composed of hemoglobin molecules. Hemoglobin like to load o2 at the lung and like to unbind at the tissue. At high partial pressure, the hemoglobin have a high bonding rate. At low partial pressure at the tissue, the hemoglobin have a low bonding rate. During exercise, muscles need more o2 and ph have a shift. Myoglobin is a protein in the muscle that binds o2 (has more affinity for o2) More co2 means more h+ ions, means more acidic. Hemoglobin replaced by myoglobin results in a better binding chance with o2, but not able to move the. O2 and unload it as well depending on the location in the body. Percentage of air is always the same, regardless of altitude, the pressure is the only thing that makes a difference.
