When Oxygen Delivery Becomes Insufficient to Support a Runner's Aerobic

When oxygen delivery becomes insufficient to support a runner's aerobic metabolism,cells switch to an emergency mode in which ________.

A) ATP is generated less efficiently by harvesting the heat energy in a cell
B) ATP is inefficiently produced and lactic acid is generated as a by-product
C) lactic acid is broken down to produce smaller amounts of ATP
D) carbon dioxide is joined with water to generate much smaller amounts of ATP

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