Biology › Respiratory system › Question #10017
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Q What happens during inspiration?

ID: #10017 Respiratory system 123 views
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#10017Q ID
EasyDifficulty
Respiratory systemTopic
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  • A Relaxation in external intercostal muscle ✔ ✖
  • B Relaxation in diaphragm ✔ ✖
  • C Contraction in diaphragm ✔ ✖
  • D No effect on diaphragm ✔ ✖
Correct Answer

Explanation

Inspiration is an active process that requires muscular effort. During inspiration, the diaphragm and external intercostal muscles contract. This contraction causes the diaphragm to move downward and the ribcage to move upward and outward, which increases the volume of the thoracic cavity. As a result, the air pressure inside the lungs decreases, and air is drawn into the lungs through the airways. Therefore, option C is the correct answer.

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