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. Amidst the range of cells that fill the human body, the smallest cell in the human body is the sperm cell. This small cell, measuring only 50 micrometers in length, has efficient functions facilitated by its size. Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell. Human cells contain the following major parts, listed in alphabetical order:The smallest cell is Mycoplasma (PPLO-Pleuro pneumonia like organims). It is about 10 micrometer in size. The largest cells is an egg cell of ostrich. The longest cell is the nerve cell. The largest cell in the human body is female ovum. Smallest cell in ... In terms of volume most of the scientist suggest that sperm is the smallest cell in human body. From head to tail, human sperm cells measure about 50 micrometers (0.05 millimeter, or roughly 0.002 inch). The tiniest object you can see with your unaided eyes is about 0.1 mm--so forget about seeing sperm without a microscope.
