Question

in which axis does the volume of thoracic cavity increases during the contraction of external intercostal muscles​

Answer 1

Answer:

Normal Quiet Breathing In a non-obese individual, for inspiration to occur the diaphragm contracts inferiorly and external intercostal muscles pull the chest wall outward, increasing the volume of the thoracic cavity.

Explanation:

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Answer 2

during contraction of external intercostal muscles results ribs and sternum to move  up and outside this will  increase in volume of thoracic  cavity in   dorso- ventral  axis