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The cell is the basic microscopic unit of your body. The major cellular structures that we will talk about in this unit are shown in this very simplified drawing.
The nucleus contains the DNA that controls the cell's function and allows it to respond to its environment. The cytoplasm that surrounds the nucleus contains small structures that make proteins, structures that supply the cell's energy, molecules that transport energy, chemical messengers, and many other functional elements, as well as storehouses of enzymes and other substances (the cytoplasmic inclusions or granules). The cell membrane controls the flow of substances into and out of the cell and contains molecules called antigens that are specific to the cell and the person.
3D Image: Copyright Bristol Productions
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The Cell
