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NEET Biology question

BiologyBreathing and Exchange of GasesNEET

Arrange the given steps by which the pulmonary volume increases in the sequence of events occurring first I. Contraction of intercostal muscles II. Lifting up of the ribs III. Sternum causing an increase in the volume of the thoracic chamber in dorsoventral axis IV. Contraction of the diaphragm which increases the volume of the thoracic chamber in antero-posterior axis

Answer: (B)

Solution

Diaphragm contraction increases thoracic volume along the antero-posterior axis (IV), intercostal muscles then contract (I), lifting the ribs (II is a consequence that follows, but per the

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Question ID VK-119129