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Q.

Which of the following is correct statement for breathing mechanism

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a

Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber in anteroposterior axis

b

The contraction of internal inter costal muscles lifts up the ribs and the sternum

c

An increase in pulmonary volume increase the intra pulmonary pressure

d

Decrease in pulmonary volume decrease the intra pulmonary pressure

answer is A.

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Detailed Solution

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

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Which of the following is correct statement for breathing mechanism