Our bodies have are roughly 10,000 trillion cells in the average human body.
Surprisingly, the two cells that are required for the human race to go on, are the biggest and the smallest cells in the human body. The largest cell in the human body is the female egg and the smallest is the male sperm. While you can’t see skin or muscle cells, the ovum is typically a millimetre in diameter, large enough to be seen with the naked eye. Yet the sperm cell is tiny, consisting of little more than a nucleus.
The human ovum is roughly 1 millimeter across and is only just visible to the naked eye. otherwise Sperm is the partner of the ovum, The human sperm is roughly 60 micrometers in length. It is not visible to the naked eye, a microscope usually being used to examine them.