Verified answer

Answer:

The diaphragm contracts and pulls downward

Explanation:

Whenever we are inhaling, we

• Get gas molecules with oxygen as one of the compinents
• Let those molecules to fill up in our lungs

If we let them fill our lungs, then, our lungs get larger, rib cage goes outward, and the diaphragm goes downward.

Why is this so?

Remember that no two matter can occupy a single space at the same time. Gas molecules that we inhale occupies the space in our lungs. Therefore, the lungs expand.

Just like the balloon. If we keep putting air in it, the balloon inflates. The same idea goes for inhalation.

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Whenever we exhale, we

• Let go of the unnecessary molecules that's left
• Let our lungs have more space available for gas molecules to enter

If we inhale through our nose, how does exhalation happens?

Our lungs have muscles. Since we have the unnecessary gas molecules in our lungs, to get them out, the muscles control our lungs, kind of like a squeeze action.

What happens to our lungs then?

As I have said, the action that the muscles do to our lungs is like a squeezing one.

If you squeeze a balloon filled with water, the water goes out right? The same idea for exhalation: lungs goes inward (smaller), the same for rib cage and diaphragm.

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Answer:

C. The diaphraghm contracts and pulls downward