The human egg (ovum) is the largest cell in the body and a nerve cell is the longest cell in the human body. The sperm is the smallest cell in human biology, but also one of the most complex.
- Most scientists suggest that sperm is the smallest cell in terms of volume. Sperm cell head measures about 4 micrometres in length, just slightly smaller than a red blood cell (RBCs)
- The largest cell is the ovum in the human body. The ovum also called the 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.