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The diagram shows the ribs and some of the muscles used in breathing.

Which muscles relax in moving from position x to position y?

DiaphrgmExternal Intercostals

A. (a) B. (b) C. (c) D. (d)

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While moving from position-x to position-y, the lungs are exhaling out the air. When lungs exhale out the air, both diaphragm & external intercostal muscles relax.

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