What is Metabolism ?
The sum total of vital activities ( movements , nutrition, growth, respiration, excretion , reproduction, behaviour ,etc. Is the life of a living being since cells are the ultimate functional units of living being , In naturally follows that the life of an organism resides in its cells. Now cells is a highly organized unit mass of living matter or protoplasm i.e. a highly organized complex chemical system. Therefore livingness of a cell resides in the physic chemical activities within is organization and these activities must continue uninterrupted as long as the cell is to remain alive the sum total of these physic chemical activities is called cell or intermediary metabolism, because every cellular activity necessarily involves chemical transformation of matter.