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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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Regarding Inspiration - choose the incorrect statement :

image
( a ) The overall increase in the thoracic volume causes a similar increase in pulmonary volume.
( b ) Inspiration is initiated by the contraction of diaphragm
( c ) Contraction of diaphragm which increases the volume of thoracic chamber in the antero-posterior axis
( d ) The contraction of internal 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
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1 Answer

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(D) is the right answer.

Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in the antero-posterior axis. 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. The overall increase in the thoracic volume causes a similar increase in pulmonary volume. An increase in pulmonary volume decreases the intra-pulmonary pressure to less than the atmospheric pressure which forces the air from outside to move into the lungs, i.e., inspiration.
answered Mar 26, 2014 by pady_1
 

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