The human body is composed entirely of cells. These cells are the building blocks which all other larger parts of the body are formed.
Cells are the basic structural units of the body.
There are two types of cells, prokaryotic and eukaryotic. These are distinguished by the presence or absence of a nucleus. The cell must have these structures in order to function properly. If one of the organelles fails to perform its job, it will affect the performance of the cell. Discuss the structure and functions of a cell membrane.