On average _____ square feet of the respiratory membrane is lost each year after age 30.

Question

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The respiratory membrane is the thin, moist lining of the lungs that allows oxygen and carbon dioxide to pass between the air and the bloodstream. As we age, the respiratory membrane becomes thinner and less efficient, and we lose some of our ability to breathe. On average, we lose about 1 square foot of respiratory membrane each year after age 30.

On Average _____ Square Feet of the Respiratory Membrane Is