Question

Why our lungs expand during inhalation for 2 marks

Answer 1

When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand.

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Answer 2

When you breathe in, or inhale,your diaphragm contracts (tightens) and moves downward. This increases the space in yourchest cavity, into which your lungs expand. The intercostal muscles between your ribs also helpenlarge the chest cavity. They contract to pull your rib cage both upward and outward when youinhale


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