Inspiratory reserve volume is defined as?

Inspiratory reserve volume is defined as?

• A. The amount of air in excess of tidal volume that can be inhaled with maximum effort
• B. The amount of air that can be exhaled after a normal exhale
• C. The air remaining after a maximal exhale
• D. The air exchanged per minute

Answer: (D)

Inspiratory reserve volume is the extra air you can inhale after taking a normal breath. After your tidal volume is filled, you have the ability to pull in additional air with a maximal effort; the amount of air gained beyond that normal inhalation is the inspiratory reserve volume. This fits into the larger set of lung volumes that combine to form the vital capacity, since vital capacity equals tidal volume plus inspiratory and expiratory reserve volumes (with residual volume not counted in vital capacity). In healthy adults, you typically see about 500 mL of tidal volume, plus roughly 2–3 liters of inspiratory reserve, plus about 1 liter of expiratory reserve, with a residual amount remaining in the lungs after a maximal exhale. The other descriptions refer to different concepts: the air you can exhale after a normal exhale is expiratory reserve volume; the air left in the lungs after a maximal exhale is residual volume; and the amount of air moved per minute is minute ventilation, a rate rather than a static volume.

Inspiratory reserve volume is the extra air you can inhale after taking a normal breath. After your tidal volume is filled, you have the ability to pull in additional air with a maximal effort; the amount of air gained beyond that normal inhalation is the inspiratory reserve volume. This fits into the larger set of lung volumes that combine to form the vital capacity, since vital capacity equals tidal volume plus inspiratory and expiratory reserve volumes (with residual volume not counted in vital capacity). In healthy adults, you typically see about 500 mL of tidal volume, plus roughly 2–3 liters of inspiratory reserve, plus about 1 liter of expiratory reserve, with a residual amount remaining in the lungs after a maximal exhale.

The other descriptions refer to different concepts: the air you can exhale after a normal exhale is expiratory reserve volume; the air left in the lungs after a maximal exhale is residual volume; and the amount of air moved per minute is minute ventilation, a rate rather than a static volume.