BIOL1003 Lecture 13: Lecture 13 BIOL - Homeostasis Blood Gas Levels
Document Summary
There are 3 ways carbon dioxide is transported in blood: 7% of carbon dioxide dissolved in plasma. Remaining 93% is transported in the red blood cells. Carbon dioxide will move from high pressure in the tissue to low pressure in the blood. Co2 + h2o carbonic acid (h2co3) co2 + h2o. At tissues pco2 high in plasma at lungs pco2 low. Carbonic acid dissocuates in blood to form h+ and hco3+ ions (h- increases acidity of blood) (important: how inspiration is triggered: co2 enters the rbc and 23% combines with globin part of hemoglobin. Co2 + hb (haemoglobin) hbco2 (carbaminohaemoglobin) co2 + hb. Moving from high pressure to low pressure in the alveolis air: remaining 70% combines with water in the red blood cell to form carbonic acid catalysed by the enzyme carbonic anhydrase in the rbc. At the tissue pco2 is high due to cellular respiration. Co2 + h2o h2co3 h- + hco3.