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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
The largest cell in the human body is the ovum, the female sex cell. The ovum is about 1000 micrometers, or one millimeter, in diameter. It is typically visible to the naked eye without the aid of a microscope or other magnification device. Apr 25 10, 7:06 AM. The largest cell in the human body is the female ovum, or egg cell. It is about 1/180 inch in diameter. The smallest cell in the human body is the male sperm. It takes about 175,000 sperm cells to weigh as much as a single egg cell.