Questions: Which statement is false regarding the transport of oxygen and carbon dioxide? A. Most of the carbon dioxide is converted to the bicarbonate ion (HCO3-). B. All of the carbon dioxide in the blood forms carbaminohemoglobin. C. Almost all the oxygen is transported by the hemoglobin in the red blood cells. D. A very small amount of O2 is dissolved in plasma.

The answer is B: All of the carbon dioxide in the blood forms carbaminohemoglobin.

Explanation for each option:

A. Most of the carbon dioxide is converted to the bicarbonate ion \(\mathrm{HCO}_{3}^{-}\).

• This statement is true. The majority of carbon dioxide in the blood is transported in the form of bicarbonate ions. This conversion occurs in red blood cells and is facilitated by the enzyme carbonic anhydrase.

B. All of the carbon dioxide in the blood forms carbaminohemoglobin.

• This statement is false. While some carbon dioxide binds to hemoglobin to form carbaminohemoglobin, it is not the primary form of carbon dioxide transport. Only a small portion of carbon dioxide is transported this way.

C. Almost all the oxygen is transported by the hemoglobin in the red blood cells.

• This statement is true. The vast majority of oxygen in the blood is bound to hemoglobin within red blood cells, allowing efficient transport to tissues.

D. A very small amount of \(\mathrm{O}_{2}\) is dissolved in plasma.

• This statement is true. Only a small fraction of oxygen is dissolved directly in the plasma; most is carried by hemoglobin.

In summary, option B is the false statement regarding the transport of oxygen and carbon dioxide in the blood.