Question

What methods provide ATP during muscle activity? Why would so many methods evolve to provide ATP to muscles?

Answer 1

Muscular activity requires continuous energy flow for it's effective working.

• At first muscles utilizes glucose that stored in muscles. Muscles have less quantity of glucose stores. So that it goes for another method of ATP supply.
• Muscles have a short-term store of energy in the form of creatine phosphate which is generated from ATP and can regenerate ATP when needed with creatine kinase.
• Another form of glucose stored in muscles is glycogen. When required this glycogen undergoes metabolism to provide ATP.
• Within the skeletal muscles some amount of glucose metabolizes anaerobically which produces two ATP and two lactic acid molecules.
• Muscle cells also contain globules of fat, which are used for energy during aerobic exercise.

So many methods are evolved to produce ATP for muscles during activity, because single method does mot produce sufficient energy for efficient muscle activity. So it utilizes many methods.