Topics: Breathing System Quiz
What is the percentage of nitrogen in inhaled air?
A. 78%
B. 21%
C. 0.04%
D. Variable
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What happens to our chests when we breathe?
A. They get bigger when we inhale and smaller when we exhale
B. They get smaller when we inhale and bigger when we exhale
C. They stay the same size when we inhale and exhale
D. They move up and down when we inhale and exhale