Carbon dioxide in venous blood
Carbon dioxide molecules are transpoed in the blood from body tissues to the lungs by one of three methods: dissolution directly into the blood, binding to hemoglobin, or carried as a bicarbonate ion. ... Second, carbon dioxide can bind to plasma proteins or can enter red blood cells and bind to hemoglobin Ref: guyton and hall textbook of medical physiology 12 edition page number: 359,360,361
Is carried by hemoglobin
Is transpoed mainly in the form of bicarbonate
Does not cross the blood brain barrier
Is conveed to bicarbonate by carbonic anhydrase in plasma
Respiratory system