Cells are the basic, fundamental unit of life. So, if we were to break apart an organism to the cellular level, the smallest independent component that we would find would be the cell. Explore the cell notes to know what is a cell, cell definition, cell structure, types and functions of cells. Human Cell is a peer-reviewed English-language journal that publishes cutting-edge research papers and reviews on all aspects of the human cell including the establishment of cell lines. The body contains trillions of cells of varying shapes and sizes. The different types of cells in the body work together to make life possible. Every cell is made up of cytoplasm that is enclosed in a membrane and includes many small molecules of nutrients and metabolites as well as many macromolecules including proteins, DNA, and RNA. The term "cell" is derived from the Latin word cellula, which means "small room."