Terminology in cell biology Cytology 2-Microscope :is an instrument used to see objects that are too small to be seen by the naked eye. 3-Cell: Fundamental unit of life. Cellular Dictionary definitions can be broad, using phrases such as "any living structure, such as a plant, animal, fungus or bacterium, capable of growth and reproduction". U organism cell 7- Multicellular organisms: are organisms that consist of more than one cell prokaryotic 9-Eukaryotic The cell membrane (also known the plasma membrane (PM) or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the inside of all cells from the outside environment (the extracellular space) which protects the cell from its environment Organelle organelle Small membranous structure in the cytoplasm of eukaryotic cells having a specific structure and function lumen 17-somatic cells: are any cell in the body that are not gametes (sperm or egg), germ cells 18-Endomembrane system A collection of membranous structures involved in transport within the cell. 19-extracellular matrix