<P> The idea that protoplasm of eukaryotes is simply divisible into a ground substance called `` cytoplasm '' and a structural body called the cell nucleus reflects the more primitive knowledge of cell structure that preceded the development of electron microscopy , when it seemed that cytoplasm was a homogeneous fluid and the existence of most sub-cellular compartments , or how cells maintain their shape , was unknown . Today , it is known that the cell contents are structurally very complex and contain multiple organelles . </P>
<P> The idea that protoplasm of eukaryotes is simply divisible into a ground substance called `` cytoplasm '' and a structural body called the cell nucleus reflects the more primitive knowledge of cell structure that preceded the development of electron microscopy , when it seemed that cytoplasm was a homogeneous fluid and the existence of most sub-cellular compartments , or how cells maintain their shape , was unknown . Today , it is known that the cell contents are structurally very complex and contain multiple organelles . </P>
what is the fluid substance of cell known as
what is the fluid substance of cell known as
cytoplasm
cytoplasm