Standard Science Primary 5 Systems

What happens to our ribcage and diaphragm when we breathe IN?

A Ribcage moves up and out; diaphragm moves down.
B Ribcage moves up and out; diaphragm moves up.
C Ribcage moves down and in; diaphragm moves up.
D Ribcage moves down and in; diaphragm moves down.
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Worked Solution

Step 1: Inhalation requires the chest cavity to expand to let air in. Step 2: The ribcage moves up and out. Step 3: The diaphragm contracts and moves down to increase volume.

Correct answer: Ribcage moves up and out; diaphragm moves down.

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