मोटर यूनिट भर्ती के हेनेमैन के आकार सिद्धांत (Size Principle) के अनुसार, मोटर इकाइयों की भर्ती मुख्य रूप से किसके आधार पर बढ़ते आकार के क्रम में होती है?

Which of the following is an internal physiological process rather than a structured physical activity or exercise?

As ATP is broken down to ADP to release energy for muscle contraction, which compound is broken down to release both energy and phosphate to allow reconstitution of ATP from ADP?