Biology · Oct / Nov 2020 · Paper 11 · Question 18
The diagram shows the rib cage and some of the muscles involved in breathing as seen from the side. [diagram of rib cage showing vertebral column, diaphragm, intercostal muscles, sternum (breastbone), ribs] What happens when the intercostal muscles shown in the diagram contract?
- AThe diaphragm moves down.
- BThe lungs inflate.
- CThe pressure inside the lungs decreases.
- DThe ribs move down.
As printed in the paper
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Correct answer: D. The ribs move down.
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