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Question

Pick the correct statement.

A
The contraction of internal intercostal muscles lifts up the ribs and sternum.
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B
The thoracic cavity is anatomically an air tight chamber.
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C
Healthy man can inspire approximately 500 ml of air per minute.
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D
During expiration, the intrapulmonary pressure is slightly below the surrounding atmospheric pressure.
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Solution

The correct option is B The thoracic cavity is anatomically an air tight chamber.
The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by ribs and lower side by the dome-shaped diaphragm, it is an air-tight chamber.
So, the correct option is 'The thoracic cavity is anatomically an airtight chamber.'

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