BIOL 3070 Lecture Notes - Lecture 17: Superoxide, Perfusion, Aith
Document Summary
Ca (co2 diffuses directly out of rbc past the plasma into gill epithelium most diffuses directly out, some converted to bicarbonate and protons by ca. Protons pumped across apical memb. and creates electrochemical gradient to create net positive charge on apical surface compared to inside of cell promotes uptake of na+ across apical membrane on basolateral side have. O2 uptake: excess proton generated sucked up by good buffering hb. Oxygen gradient btwn environment in water breathers and air breathers. Po2 decreases as move from env"t across resp. epithelium, blood, then into tissues (general pattern remains same in water vs air-breathers) Airbreathers if look at co2 concentrations in env"t vs. co2 expelled by tissues, large diff! in water breathers env"tal co2 very similar to concentration at tissues. B/c o2 more variable and less soluble in water than co2, o2 main regulator of breathing in aquatic animals. When insect breathing in oxygen, trachea expanded and when not active, trachea compressed (lower image)
