Breathing and Exchange of GasesHard

Question

What is the vital capacity of our lungs ?

Options

A.Inspiratory reserve volume plus tidal volume
B.Total lung capacity minus expiratory reserve volume
C.Inspiratory reserve volume plus expiratory reserve volume
D.otal lung capacity minus reserve volume

Solution

Vital capacity is the sum of inspiratory reserve volume, tidal volume and expiratory reserve volume. It is about 4800 mL.
Total lung capacity is the sum of vital capacity and residual volune, ie, vital capacity of our lungs lung capacity minus reserve volume.
Total volume is the amount of air, which normally passes into and out of the lungs during each cycle of quit breathing. It is about 800 mL in adult person.
Inspiratory reserve volume is the extra volume of air that can be inhaled into lungs during deepest possible inspiraton.

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