Question

11.
Carefully study the diagram of the human respiratory system with labels P, Q, R and S.
Select the option which gives correct identification and main function and for
characteristic
P
Q
S
R
A P - Nostril/ nasal cavity ensures that the air-passage does not collapse
B. Q- Rings of cartilage: have fine hair to filter the passing air
R - Diaphragm: it flattens when we breathe in
D. S - Ribs: they are lifted when we breathe out​

Answer 1

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