The cells that make up our body are so small that you could fit over 200 of them on the full stop at the end of this sentence.
All living organisms, whether plants or animals, are made up of microscopic units called cells. The cell occupies the same central position in biology as the atom in the physical sciences.
Cells vary in shape and size. They may be oval, spherical, rectangular, polygonal, spindle shaped, star shaped, rod-shaped or totally irregular like the nerve cell.
Man has 46 chromosomes, and these occur in pairs i.e., diploid condition.