Which of the following is NOT one of the three essential components for maintaining oxygen supply to the body?

The correct answer identifies nourishment as the component that is not essential for maintaining oxygen supply to the body. The three critical components for oxygen delivery are airway, breathing, and circulation.

The airway is crucial because it allows for the passage of air into the lungs, where oxygen is exchanged for carbon dioxide. Breathing refers to the mechanical process of inhaling oxygen-rich air and exhaling carbon dioxide; this process is vital for sustaining the body’s oxygen levels. Circulation involves the movement of oxygenated blood from the lungs to various tissues and organs throughout the body, which is essential for supplying cells with the oxygen they need to function efficiently.

Nourishment, while important for overall health and providing energy, does not directly relate to the immediate supply of oxygen. The body's oxygen needs can be met independently of nutritional factors, making it the component that falls outside the essential trio for oxygen delivery.