Question 27

Hyperventilation occurs when the blood level of carbon dioxide is abnormally low.

Hyperventilation is characterized by an increased rate of breathing, which leads to a decrease in carbon dioxide levels in the blood, resulting in respiratory alkalosis.

A) Carbon monoxide

Carbon monoxide does not play a direct role in hyperventilation. While it is a toxic gas that can interfere with oxygen transport, it does not affect the respiratory rate in the same manner as carbon dioxide levels.

B) Carbon dioxide

This is the correct answer, as hyperventilation causes a significant decrease in carbon dioxide levels in the blood. When carbon dioxide levels drop too low, it can lead to symptoms such as lightheadedness, tingling, and even fainting due to increased blood pH.

C) Hydrogen

Hydrogen is not a primary gas involved in respiratory control. While hydrogen ions (in relation to pH) affect breathing indirectly, they are not the gas that becomes abnormally low during hyperventilation.

D) Nitrogen

Nitrogen is the most abundant gas in the atmosphere but does not play a significant role in the body's respiratory processes. Its levels do not fluctuate in response to breathing patterns like carbon dioxide does.

Conclusion

The correct answer is B) Carbon dioxide, as hyperventilation leads to a decrease in carbon dioxide levels, which triggers various physiological responses. Other options do not relate to the mechanism of hyperventilation and are therefore incorrect, highlighting the importance of carbon dioxide in regulating respiratory function.