What connects the oxygen supply to the patient via a cannula or mask?

• A. Oxygen concentrator
• B. Tubing
• C. Mask
• D. Cannula

Answer: (B)

The connecting piece is the conduit that carries oxygen from the source to the patient’s delivery device. Tubing acts as that pathway, flexible and sized to reach from the oxygen source (like a concentrator, cylinder, or wall outlet) to the nasal cannula or face mask. It ensures a continuous, leak-free flow so the patient actually receives the prescribed oxygen. The other items describe where the gas comes from (the source) or what the patient breathes through (the cannula or mask), but they don’t provide the physical link between source and delivery device.