Biology for IGCSE & O level - Gas Exchange In Humans (Section 3 - No. 37)
What happens to the air pressure inside the lungs during inhalation?
It increases.
It decreases.
It remains the same.
It fluctuates randomly.
Explanation
During inhalation, the chest cavity expands, decreasing the pressure inside the lungs relative to the outside atmosphere, causing air to flow in.
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