A patient is able to sustain a flow of 900 cc/s to hold the ball of a flow-oriented incentive spi-rometer aloft for 2 seconds. Her inspired volume is ____ L
a. 0.18 c. 1.45
b. 0.90 d. 1.80
ANS: D
Flow = Tidal volume ÷ Inspiratory time.
Tidal volume = Flow ? Inspiratory time.
Tidal volume = 900 mL/s ? 2 s = 1800 mL, or 1.80 L.
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