What gas is a combination of Helium and Oxygen?

The selection of Heliox as the correct answer highlights its significance in medical settings, particularly in respiratory therapy. Heliox is a mixture of helium and oxygen, which is used to improve the delivery of oxygen to patients with obstructive airway conditions. The properties of helium make it much less dense than other gases, leading to a reduction in resistance during breathing. This can be particularly beneficial for patients with conditions such as asthma or chronic obstructive pulmonary disease (COPD), as it allows for easier airflow and can help alleviate symptoms.

In contrast, the other gases listed serve different physiological roles and are not combinations of helium and oxygen. Carbon dioxide is a waste product of metabolism and does not have therapeutic uses in the same context. Nitric oxide is employed in treating pulmonary hypertension and is a distinct gas with unique properties, while nitrous oxide is primarily used as an anesthetic and analgesic agent, again with no relation to helium or oxygen combinations. Understanding the unique applications of gas mixtures like Heliox is crucial for effective patient care in respiratory conditions.