Question

Thoracic volume is reduced by

Answer 1

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P= 1/v. As the volume increases, pressure decreases; as volume decreases, the pressure increases. Inspiration: diaphragm contracts (drops) increasing volume of thoracic cavity. contraction of external intercostals muscle helps increase volume of.

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Answer 2

Answer:Thorasic volume is reduced by contraction and relaxation in diapgram.

Explanation: By contraction in diaphgram results in increase in volume in anterio- posterior axis and relaxation results in decrease in the volume in anterio-posterior axis similarly contraction in external inter coastal muscles results in increase in dorso-ventrally axis and vice versa in relaxation in external inter-coastal muscles.

So from above explanation we get that,

Pressure is inversely proportional to volume. That is increase in intra pulmonary pressure = decrease in pulmonary volume.

And this is done by diapgram.

Hope you get the answer.