Refer to the graph. When you are lying on the couch, point _______ on the graph would best represent the PO₂ in your leg muscles.When you have been running hard on a treadmill for 30 minutes, point _______ on the graph would best represent the PO₂ in your leg muscles.Oxygen is being released faster to your leg muscles when their PO₂ is at point _______ than when it is at either of the other two points on the graph.

Question

Quizplus · Accepted Answer

- When lying on the couch, there is no muscle activity, therefore the PO₂ is at its lowest point, which is represented by point A on the graph. - When running on a treadmill for 30 minutes, the muscles are fatigued and have been contracting repeatedly, causing the PO₂ to increase. This is best represented by point B on the graph. - Oxygen is being released faster to the leg muscles when their PO₂ is higher, which means it is at point A on the graph. So, the correct order of the points would be A, B, A, which is represented by choice C.

Refer to the Graph