Structure and Function of Cells
Organisms show Variety in Cell Number, Shape and Size : Scientists use microscopes that magnify objects. Stains (dyes) are used to color parts of the cell to study the detailed structure. There are millions of living organisms. They are of different shapes and sizes. Their organs also vary in shape, size, and number of cells. Number of Cells : The human body has trillions of cells that vary in shape and size. Different groups of cells perform a variety of functions. Organisms made of more than one cell are called multicellular (multi: many; cellular: cell) organisms. Example - Octopus The single-celled organisms are called unicellular (uni: one; cellular: cell). Example - Bacteria Size of cells : The size of the cells in living organisms may be as small as a millionth of a meter or maybe as large as a few centimeters. However, most of the cells are microscopic in size and are no