In a normal respiratory cycle the volume of air that moves into and out of  the lungs is about 500 mL. The reserve and residual volumes of air th at  remain in the lungs occupy about  2000mL and a single respiratory cycle for  an average human takes about 4 seconds. Find a model for the total volume of air V(t) in the lungs as a function of time. Help! My homework is due really soon and I can't figure it out!  My book is called Biocalculus: Calculus for Life Sciences.

Question

In a normal respiratory cycle the volume of air that moves into and out of  the lungs is about 500 mL. The reserve and residual volumes of air th at  remain in the lungs occupy about  2000mL and a single respiratory cycle for  an average human takes about 4 seconds. Find a model for the total volume of air V(t) in the lungs as a function of time.

Help! My homework is due really soon and I can't figure it out!  My book is called Biocalculus: Calculus for Life Sciences.

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