An adult human at rest inhales and exhales approximately 450 mL of air (called the tidal volume) in approximately 5 sec.

Question

An adult human at rest inhales and exhales approximately 450 mL of air (called the tidal volume) in approximately 5 sec. However, at the end of each exhalation, the lungs still contain a volume of air, called the functional residual capacity (FRC), which is approximately 2100 mL.

(a) What volume of air is in the lungs after inhalation?
The volume of air in the lungs after inhalation is
mL.

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