title: Energy requirements for intracapillary PCO 2  gradients.
mesh_terms: D002196:Capillaries; D002199:Capillary Permeability; D002245:Carbon Dioxide / Q000097:blood*; D002463:Cell Membrane Permeability; D004912:Erythrocytes; D006454:Hemoglobins; D006801:Humans; D008168:Lung
chemical_list: D006454:Hemoglobins; D002245:Carbon Dioxide