Protoplasm

Protoplasm is the living substance that makes up a cell. In plant cells, it is surrounded by a cell wall. In animal cells, the whole cell is made of protoplasm, surrounded by a cell membrane. Protoplasm in living beings is made up of about 75-80 percent water. The semifluid, translucent substance that forms the living matter in all plant and animal cells. Composed of proteins, fats, and other substances suspended in water, it includes the cytoplasm and (in eukaryotes) the nucleus.