Zoology - Breathing and Exchange of Gases Question with Solution | TestHub

Residual volume (RV)

It is the volume of air that remains in the lungs after maximum forceful expiration. In other words, it is the volume of air that cannot be expelled from the lungs. This volume remains unchanged regardless of the lung volume at which expiration was started.

Inspiratory Capacity

$\left(\mathrm{I}\mathrm{C}\mathrm{ }=\mathrm{ }\mathrm{T}\mathrm{V}\mathrm{ }+\mathrm{ }\mathrm{I}\mathrm{R}\mathrm{V}\right)$

It is the total volume of air that a person can inspire after a normal

expiration.

Expiratory Capacity

$\left(\mathrm{E}\mathrm{C}\mathrm{ }=\mathrm{ }\mathrm{T}\mathrm{V}\mathrm{ }+\mathrm{ }\mathrm{E}\mathrm{R}\mathrm{V}\right)$

It is the total volume of air that a person can expire after a normal

inspiration.

Functional Residual Capacity

$\left(\mathrm{F}\mathrm{R}\mathrm{C}\mathrm{ }=\mathrm{ }\mathrm{E}\mathrm{R}\mathrm{V}\mathrm{ }+\mathrm{ }\mathrm{R}\mathrm{V}\right)$

It refers to the volume of air that remains in the lungs after a

normal expiration.

Vital Capacity

$\left(\mathrm{V}\mathrm{C}\mathrm{ }=\mathrm{ }\mathrm{E}\mathrm{R}\mathrm{V}\mathrm{ }+\mathrm{ }\mathrm{T}\mathrm{V}\mathrm{ }+\mathrm{ }\mathrm{I}\mathrm{R}\mathrm{V}\right)\mathrm{ }$

It is the maximum volume of air that a person can inspire after a

forced expiration. Or

It is the maximum volume of air a person can expire after a forced

inspiration.

Total Lung Capacity

$\left(\mathrm{T}\mathrm{L}\mathrm{C}\mathrm{ }=\mathrm{ }\mathrm{E}\mathrm{R}\mathrm{V}+\mathrm{T}\mathrm{V}+\mathrm{I}\mathrm{R}\mathrm{V}+\mathrm{R}\mathrm{V}\mathrm{ }=\mathrm{ }\mathrm{V}\mathrm{C}+\mathrm{R}\mathrm{V}\right)$

It refers to the total volume of air that can be accommodated in the

lungs at the end of a forced inspiration.