Saunders Respiratory Practice 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which primary gas is taken in during respiration?

Nitrogen

Oxygen

During respiration, the primary gas that is taken in is oxygen. Oxygen is vital for the process of cellular respiration, where cells convert glucose and oxygen into energy, carbon dioxide, and water. This process occurs in the mitochondria of cells and is essential for producing adenosine triphosphate (ATP), the energy currency of the cell.

While nitrogen is present in the air we breathe, it is not utilized in the respiratory process; instead, it is inert under normal physiological conditions. Carbon dioxide is actually a byproduct of respiration, as it is produced when cells metabolize nutrients for energy. Argon is another inert gas found in the atmosphere, and like nitrogen, it is not involved in the respiratory processes essential for life. Therefore, oxygen is the key gas that organisms require to sustain their metabolic functions and overall vitality.

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Carbon Dioxide

Argon

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