Standard Science Primary 5 Systems

What happens to the ribcage and diaphragm when a person breathes IN?

A Ribcage moves outwards, diaphragm moves downwards
B Ribcage moves outwards, diaphragm moves upwards
C Ribcage moves inwards, diaphragm moves downwards
D Ribcage moves inwards, diaphragm moves upwards
Show Worked Solution

Worked Solution

Step 1: Breathing in requires more space in the chest cavity. Step 2: The ribcage expands outwards and upwards. Step 3: The diaphragm contracts and moves downwards to create a vacuum effect.

Correct answer: Ribcage moves outwards, diaphragm moves downwards

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