Inspiration is produced by a ..... in the pressure in the thoracic cavity and in the air passages of the lungs.

PULMONARY PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Inspiration is produced by a ____ in the pressure in the thoracic cavity and in the air passages of the lungs.

A	decrease
B	increase
C	consistency
D	None of the above

Explanation:

Detailed explanation-1: -During inspiration, the diaphragm contracts and the thoracic cavity increases in volume. This decreases the intraalveolar pressure so that air flows into the lungs.

Detailed explanation-2: -The Process of Inspiration The pleural cavity normally has a lower pressure compared to ambient air (–3 mmHg normally and typically –6 mmHg during inspiration), so when it expands, the pressure inside the lungs drops.

Detailed explanation-3: -When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.

There is 1 question to complete.