The correct option is C Diaphragm and external intercostal muscles contractDuring inspiration #160;the diaphragm contracts and pulls downward. At the same ti ...

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Inspiration

During inspir...

Question

During inspiration.

Diaphragm and external intercostal muscles relax

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Diaphragm and internal intercostal muscles relax

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Diaphragm and external intercostal muscles contract

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Diaphragm and internal intercostal muscles contract

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Solution

The correct option is C Diaphragm and external intercostal muscles contract
During inspiration the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.
So, the correct option is C.

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Similar questions

Mark the correct pair of muscles involved in normal breathing in humans.

(a) External and internal intercostal muscles

(b) Diaphragm and abdominal muscles

(d) Diaphragm and intercostal muscles

Q. During inspiration the external intercostal muscles ________________ and the ribs move_______________.

Q. During inspiration the external intercostal muscles ________________ and the ribs move___________________

Q. The external intercostal muscles relax during inspiration.

Q. Assertion :Inspiration occurs due to muscular relaxation. Reason: During inspiration, the diaphragm and external intercostal muscle contract simultaneously.

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