Daniel was rushed from the accident scene to the hospital, and in the ambulance his basic respiratory function was monitored using a ______

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pulse oximeter

Daniel's basic respiratory function was most likely monitored using a device called a pulse oximeter. A pulse oximeter is a non-invasive medical device that measures the oxygen saturation levels in the blood and also monitors the heart rate.

To use a pulse oximeter, the healthcare professional places a small clip-like device, usually on a finger, earlobe, or toe, which shines a beam of light through the skin. The device measures the amount of light absorbed by the oxygenated and deoxygenated hemoglobin in the blood, providing real-time information about the oxygen levels.

By monitoring Daniel's respiratory function with a pulse oximeter, the medical team can quickly assess his oxygen levels and make necessary interventions to ensure adequate oxygenation.