About what share of carbon dioxide waste is picked up at the tissues and carried by erythrocytes?

1. Erythrocytes pick up inhaled oxygen at the lungs and carry it to the tissues. 2. On the return leg they carry only part of the carbon dioxide load, about 24 percent of it. 3. The rest, about 76 percent, dissolves in plasma, either staying as dissolved carbon dioxide or forming bicarbonate ion. 4. The two figures sum to 100 percent, which is the internal check. 5. About 76 percent is therefore the plasma share and is the trap for a candidate who inverts the two. 6. Neither 4 percent nor 50 percent appears anywhere in this partition. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.3 Erythrocytes_