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The largest cell is ovum in the human body. The ovum also called egg cell is the reproductive cell in the female body. Ovum is 20 times bigger than the sperm cells and has a diameter of about 0.1 mm. The sperm is the smallest cell in terms of volume. Sperm cell head measures about 4 micrometers in length, just slightly smaller than a red blood cell. A cell is described as the smallest, basic unit of life in charge of all the processes of life.