Biology · Oct / Nov 2020 · Paper 12 · Question 18
The diagram shows the rib cage and some of the muscles involved in breathing as seen from the side. [diagram: rib cage with labels 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
Show the answer
Correct answer: D. The ribs move down.
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.