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  • Which of the following muscles is primarily responsible for increasing the volume of the thoracic chamber during inspiration?  Option: 1</

Which of the following muscles is primarily responsible for increasing the volume of the thoracic chamber during inspiration?


 

Option: 1

Diaphragm


Option: 2

External intercostal muscles


Option: 3

Internal intercostal muscles

 


Option: 4

Sternocleidomastoid muscle


Answers (1)

best_answer

The diaphragm is the primary muscle responsible for increasing the volume of the thoracic chamber during inspiration. It is a dome-shaped muscle located at the base of the thoracic cavity, separating it from the abdominal cavity. During inspiration, the diaphragm contracts and moves downward, causing it to flatten and increase the vertical dimension of the thoracic chamber. This downward movement of the diaphragm expands the lungs, creating a negative pressure that draws air into the respiratory system.

Hence, the correct answer is option 1

Posted by

HARSH KANKARIA

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