Ideas in this flowchart

• Muscle contraction depends on energy delivery to the muscle.
• Each movement consumes cellular energy.
• Without an adequate energy supply, muscle function suffers.
• Muscles can store energy from glucose as glycogen.
• This glycogen-storage ability is shared with the liver.
• Muscle glycogen is used differently from liver glycogen.
• Muscles use all of their own stored energy.
• Muscles do not export their stored energy to other organs.