Question

Does the contraction of the diaphragm result in a decrease in the volume of the thoracic cavity or an increase in the volume of the thoracic cavity, or neither of these?

Answer 1

Contraction of diaphragm makes it flatten. This increases the length of the thoracic cavity, hence volume of thoracic cavity increases. Contraction of diaphragm helps us to breathe in.

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Explanation:

https://dr282zn36sxxg.cloudfront.net/datastreams/f-d%3A430124651c903b86c886c4032a62f50f75267b5d60e1005ac2d02a92%2BIMAGE_THUMB_POSTCARD%2BIMAGE_THUMB_POSTCARD.1

(https://useruploads.socratic.org/6iv9bstxSUi8FnuKSx9g_diaphragm.1)