Standard Science Primary 5 Systems

What happens to the ribcage and diaphragm when a person inhales?

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

Step 1: To inhale, the chest cavity must expand. Step 2: The ribcage moves up and out. Step 3: The diaphragm contracts and moves down, creating more space for air to enter the lungs.

Correct answer: Ribcage moves up and out; Diaphragm moves down

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