Flow Down Gradients Case Study During breathing, the respiratory muscles expand the lungs. This causes the pressure inside the lungs to drop, because pressure and volume are inversely related (an increase in volume decreases pressure, and vice versa). Aoheric press sea evela 760mmg 1. How do you calculate the value of a pressure gradient? What is the value of the pressure gradient that is driving air flow in this system? Would air flow into or out of the lungs?

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