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In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath.

Part A On a cold winter day when the temperature is -19.0 oC, what is the amount of heat needed to warm to internal body temperature (37 oC ) the 0.520L of air exchanged with each breath? Assume that the specific heat capacity of air is 1020J/(kg*K) and that 1.0 L of air has a mass of 1.3g.

Part B How much heat is lost per hour if the respiration rate is 19.0 breaths per minute?

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