Of the 439 Million People Expected in 2050,how Many of These

question 21

Multiple Choice

Of the 439 million people expected in 2050,how many of these U.S.citizens will be older than 65?

• A)24 million
• B)47 million
• C)63 million
• D)89 million

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Definitions:

Vital Capacity (VC)

The maximum amount of air a person can expel from the lungs after a maximum inhalation, a measure of lung function.

Inspiratory Reserve Volume (IRV)

The additional amount of air that can be inhaled after a normal inhalation, contributing to total lung capacity.

Expiratory Capacity (EC)

The maximum volume of air that can be exhaled from the lungs after a normal tidal volume exhalation.

Functional Residual Capacity (FRC)

The volume of air present in the lungs at the end of a passive expiration, combining residual and expiratory reserve volumes.