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Which of the following sequences is correct to initiate inspiration?
(i) The contraction of external intercostal muscles raises the ribs and sternum
(ii) Volume of thorax increases in the dorso-ventral axis
(iii) Intrapulmonary pressure decreases
(iv) Diaphragm contraction
(v) Air rushes into lungs
(vi) Volume of thorax increases in the anterior-posterior axis
(i), (ii), (iv), (v), (iii), (vi)
(i), (ii), (iii), (iv), (vi), (v)
(i), (ii), (iv), (vi), (iii), (v)
(vi), (v), (i), (ii), (iii), (iv)
Answers (1)
Mechanism of Inspiration -
Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in the antero-posterior axis.
- wherein
The contraction of external inter-costal muscles lifts up the ribs and the sternum causing an increase in the volume of the thoracic chamber in the dorso-ventral axis.
Correct option is 3
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