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(C) The thoracic cavity is anatomically an air-tight chamber. This is essential because any change in the volume of the thoracic cavity will be reflec

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The thoracic cavity is anatomically an air-tight chamber.

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(C) The thoracic cavity is anatomically an air-tight chamber. This is essential because any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity. Such an arrangement is crucial for breathing,as we cannot directly alter pulmonary volume. The contraction of external intercostal muscles (not internal) lifts the ribs. $RBCs$ transport both oxygen and carbon dioxide. $A$ healthy man inspires $500 \; mL$ of air per breath (Tidal Volume),not per minute.

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Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

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State the sequence of events for inspiration (breathing in).
$I$ - Increase in lung volume
$II$ - Decrease in intrapulmonary pressure
$III$ - Contraction of respiratory muscles
$IV$ - Increase in thoracic volume
$V$ - Air rushes into the lungs

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