Carbon Dioxide Transport Quiz

______ diffuses in the opposite direction (ie, from tissue cells to blood) and is transported to the lungs for excretion. The amount of ______ in transit is one of the major determinants of the acid–base balance of the body. Normally, only 6% of the venous ______ is removed, and enough remains in the arterial blood to exert a pressure of 40 mm Hg. Most of the ______ (90%) enters the red blood cells; the small portion (5%) that remains dissolved in the plasma (PCO2) is the critical factor that determines ______ movement in or out of the blood.