馬拉松運動員各生理機能同普通人有咩分別??

they are still the same, i.e. normal people can by training become a long distance runner.

what they are different are at the cellular level, where they are more tune in the pathway to cater for the need for long distance runner.

what are the needs for long distance runner?
they need ensure to have a long and sustainable energy supply,

i.e., they will be able to use fat as their primary energy source, instead of glucose, their circulation system is more efficient, the breathing system opens with more volume, they probably have more red blood cell so that they can delivery more oxygen to their body...