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Select the correct statement. (1) Expiration is initiated due to contraction of diaphragm. (2) Expiration occurs due to external intercostal muscles. (3) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration. (4) Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.
Select the correct statement.
(1) Expiration is initiated due to contraction of diaphragm.
(2) Expiration occurs due to external intercostal muscles.
(3) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.
(4) Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.
biology
Select the correct statement.
(1) Expiration is initiated due to contraction of diaphragm.
(2) Expiration occurs due to external intercostal muscles.
(3) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.
(4) Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.

The correct option is (3) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

This is because – The diaphragm and external intercostal muscles contract during inspiration, increasing the volume of the thoracic cage. As a result, the intrapulmonary pressure falls below air pressure, resulting in inspiration.
The relaxation of the diaphragm causes exhalation to begin.

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