★ Breathing System Quiz
What is the main gas exchanged in the alveoli?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Water vapour
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What is the function of the diaphragm?
A. To carry air to and from the lungs
B. To warm and moisten the air
C. To trap dirt particles and bacteria
D. To cause air to move into or out of the lungs
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