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Respiration in Humans

During inhala...

Question

During inhalation, the diaphragm becomes and ribs move .

A

upwards

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B

flat

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C

downwards

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D

concave

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Solution

The correct option is B flat
During inhalation, the diaphragm flattens and the ribs move upwards and outwards due to contraction of the intercostal muscles. This increases the volume of the thoracic cavity and the pressure decreases. As the outside pressure is higher, air gushes into the lungs.

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During inhalation, the ribs move up and outward and the diaphragm moves in. this movement decrease the space in our chest cavity and the air rushes in. During exhalation, the ribs moves down and inward and the diaphragm moves up. This movement increases the space in our chest cavity and the air is pushed out.

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