Smallest cell: Learn the names and sizes

Learn the names and sizes of the smallest and largest cells in the human body, such as cerebellum's granule cell, sperm, red blood cell, ovum, and ostrich egg. Find out how they are measured and what they do in the body. Cells are usually very ... However, the smallest cell in the human body in terms of length is the Cerebellum’s Granule Cell. It is estimated that there are about 50 billion such cells in the human body. The cell is the structural unit of life with various shapes and size. The size of the cell ranges from 0.5 micrometers to 100 micrometers. Mycoplasma gallicepticum, a parasitic bacterium is thought to be the smallest known organisms with the size from 0.2 to 0.3 micrometer, capable of independent growth and reproduction. Later, the name for mycoplasma was pleuropneumonia-like organisms or PPLO.