The resting heart's fuel of choice is ______, but upon the imposition of a heavy workload, the heart will greatly increase its rate of ______ consumption.

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Because of the highly aerobic metabolism of the heart, many substances can be used as energy sources for the heart.Free fatty acids are the resting heart's fuel of choice.However, upon the imposition of a heavy workload, the heart will greatly increase its rate of glucose consumption, derived mainly from its relatively limited glycogen supply.Other substances that can be utilized by the heart for energy when necessary include lactate, ketones, and amino acids.

The Resting Heart's Fuel of Choice Is ______, but Upon