cellulo-, celluli-, cellul-
(Latin: a small cell, consisting of cells; a small storeroom)
"Pertaining to cells"; that is, "microscopic-protoplasmic masses, each made up of a nucleus enclosed in a semipermeable membrane or to cell tissue".
The term acellular did not come into use until the 1940s when the development of cellular technology came into existence and; as a result, it became a better study of cellular composition.
2. The most abundant polysaccharide in nature , a rigid, colorless, unbranched, insoluble, long chain polymer forming the skeleton of most plant structures and of plant cells.
3. A carbohydrate polymer of the simple sugar glucose.
4. The chief constituent of the cell walls of plants and of wood, cotton, hemp, paper, etc.
It is found in the cell walls of plants and green algae, as well as dinoflagellates (any of numerous minute, chiefly marine protozoans). Cellulose is said to be the most abundant compound on earth that is manufactured by living things.
The extracellular membrane of a cell consists of double layers of fatty materials and proteins that hold each one together.
Additional functions of the extracellular membranes involve the regulating of the passages of materials into and out of the cells which enable useful substances like nutrients and oxygen to enter them and waste materials like carbon dioxide and substances like hormones to leave them.