Question

IV.
What happens during the process of breathing in –
External
diaphragm
intercostal muscles
a)
Contracts
Arches
b)
Contracts
Flattens
c)
Relaxes
Arches
d)
Relaxes
Flattens​

Answer 1

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Answer 2

Hey...

• When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale. ✔✔