Oxygen molecules are polar and dissolve so poorly in blood plasma that there is NOT enough oxygen to meet the metabolic demands of a vertebrate.However,red blood cells contain ________,which greatly increases the oxygen content of blood.

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Hemoglobin is a protein found in red blood cells that binds oxygen molecules. Each hemoglobin molecule can bind up to four oxygen molecules, greatly increasing the oxygen content of blood. This allows oxygen to be delivered efficiently to tissues throughout the body. Carbon dioxide, alveoli, and nodules do not increase the oxygen content of blood.

Oxygen Molecules Are Polar and Dissolve So Poorly in Blood