Answer:
the correct answer is: 1) 21%.
Explanation:
Low flow systems typically provide an inspired O2 concentration of 21%.
In medical settings, low flow systems are commonly used to deliver supplemental oxygen to patients. These systems include nasal cannulas and simple face masks. The flow rate of oxygen delivered through these devices is typically lower than the patient's total inspiratory flow rate, meaning that a portion of the inspired air is mixed with room air.
The concentration of oxygen in room air is approximately 21%. When using a low flow system, the amount of supplemental oxygen added to the inspired air is limited, usually ranging from 1-6 liters per minute. Therefore, the inspired oxygen concentration in a low flow system remains close to the 21% level of room air.
Hence, the correct answer is: 1) 21%.
