Cytoplasm
In cell biology, the cytoplasm is all of the material within a cell, enclosed by the cell membrane, except for the cell nucleus. The material inside the nucleus and contained within the nuclear membrane is termed the nucleoplasm. The main components of the cytoplasm are cytosol – a gel-like substance, the organelles – the cell's internal sub-structures, and various cytoplasmic inclusions. The cytoplasm is about 80% water and usually colorless.
Adventure Thru Inner Space
A large pulsating red ball could then be seen inside the atom. ""And there is the nucleus of the atom! Do I dare explore the vastness of ITS inner space? No, I dare not go on. I must return to the realm of the molecule, before I go on shrinking...forever!""