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PLEASE ANSWER QUESTIONS A, B, C, D, and E. PLEASE PROVIDEEXPLANATIONS AS WELL.
25. The figure below depicts one cycle of inhalation and exhalation in an adult human at rest. A typical human breath is about 500mL and the partial pressure of oxygen (PO₂) of external air at sea level is 160mm Hg. Answer the following questions based on this figure. A. Interpret the diagram below. What are the circles? What is the difference between the grey and white shading? What are the other shapes? What are the volume changes that you see? B. Why is the partial pressure of O₂ (PO₂) lower in the lungs than it is in the dead space during inspiration? C. After exhalation, why is the PO₂ in the dead space after exhalation lower than it is in the external air? D. A baby giraffe is about the same height and weight as an adult human, so you can assume it has a similar breath volume as a human. What would you predict about PO2 in the lungs at the end of a baby giraffe's inhalation if breath volume? Explain your prediction. E. At high altitudes, the PO₂ of air declines. For example, at the top of Mount Everest, the PO₂ of air is about 53mm Hg. What consequence does this have for gas exchange in humans? Explain your answer, using the Fick equation to demonstrate how high altitude will affect human respiration. PO₂ = 160 mm Hg □PO₂ = 100 mm Hg atmospheric air Inhalation 500 mL 150 350 150 2200 mL 2700 mL End of inhalation 2200 ml End of exhalation dead space Air from dead space 2200 mL Exhalation