A. mouth
B. nostrils
C. ribs
D. diaphragm
Correct Answer:
Option A – mouth
Explanation
The act of breathing has two stages – inhalation and exhalation
– Inhalation – the intake of air into the lungs through expansion of chest volume.
– Exhalation – the expulsion of air from the lungs through contraction of chest volume.
Inhalation and exhalation involve muscles:
– Rib muscles = the muscles between the ribs in the chest.
– Diaphragm muscle
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