Cell is smallest structural and functional unit of body. 12 body system found in human body every system consist by cell every single cell have different type of function in human body.
Similar cell in structure and function formed a tissue. Similar tissue formation of a organ. Relative organ in function formed a system. All system meet together made a body.
Energy essential for maintain function and structure of a body, a system, a organ, a tissue and a cell. Every cell have own power house called mitocondria.
When a human work to prolonged period without eat food mitocondria supply energy to cell.
Above written every cell have own mitrocondria so every mitocondria supply energy to own cell not another.
Mitocondria saved energy during digestion of food in chemical form but when need of energy mitocondria convert into energy and supply own cell.
I will ask some questions in next blog. You need read this care fully. I will write function and structure of mitochondria.
They people are give write answer I will upvote and comment of their answer.