A person hyperventilates if the blood level of which of the following dissolved gases is abnormally low?

Carbon monoxide (CO) is a toxic gas that can bind to hemoglobin in red blood cells, reducing the blood's ability to carry oxygen. While high levels of carbon monoxide can be dangerous and cause symptoms of poisoning, it does not directly relate to hyperventilation, which is primarily concerned with CO2 levels.

Hydrogen ions in the blood are involved in the regulation of pH but do not directly cause hyperventilation. The body primarily monitors CO2 levels rather than hydrogen levels for respiratory control. Therefore, while changes in hydrogen ion concentration can affect acid-base balance, they are not the primary factor in hyperventilation.

Nitrogen is a major component of the air we breathe, but it is not actively involved in the respiratory process in the same way that carbon dioxide is. Nitrogen is largely inert in the body and does not influence hyperventilation, making it irrelevant to the question of which gas level is abnormally low during this condition.