BIOL 102 Lecture Notes - Lecture 13: Carbonic Anhydrase, Air Sacs, Globin
Document Summary
Birds: unidirectional and continuous ventilation to maximize gas exchange. Lungs compressed during inhalation and expand during exhalation. Bpg reversibly combing with deoxygenated hemoglobin lowers its affinity for o2. At any po2; hb releases more o2 that it usually would. Bpg shifts the o2-binding/dissociation curve of mammalian hemoglobin to the right. High altitudes rbc exposed to lower po2 bpg level increases easier for hb to deliver more o2 to tissues. Co2 is transported as bicarbonate ions in the blood. Co2 is highly soluble and readily diffuses through cell membranes. Very little dissolved co2 is transported in the blood. Most co2 produced by the tissues is transported to the lungs in the form of bicarbonate ions (hco3. Co2 dissolves in water carbonic acid (h2co3) Extracellular fluid: reaction between carbon dioxide and water proceeds slowly. Endothelial cells carbonic anhydrase speeds conversion of co2 to h2co3. Plasma in exchange for chloride ions: hco3, lungs reversed process hco3.
