Standard Science Primary 5 Systems

Which of the following describes the movement of the ribcage and diaphragm during inhalation?

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: During inhalation, the chest cavity must expand. Step 2: The ribcage moves up and out to increase space. Step 3: The diaphragm contracts and moves downwards. Step 4: Final Answer: Option A.

Correct answer: Ribcage moves up and out, diaphragm moves down

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