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Inspiration occurs when

1. Pressure inside lungs is lower than atmospheric pressure
2. Pressure inside lungs is higher than atmospheric pressure
3. Pressure inside lungs is same as atmospheric pressure
4. Pressure has no effect

Correct answer: Pressure inside lungs is lower than atmospheric pressure

Solution

Inspiration happens when the pressure inside the lungs becomes lower than atmospheric pressure, creating a gradient that drives air into the lungs. Air always flows from higher pressure to lower pressure until pressures begin to equalize.

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