Cells are regarded as the building blocks of life because every organism is made up of many cells. They form the basic structural and functional unit of a living organism. This is explained in the popular cell theory by Theodor Schwann, Matthias Schleiden, and Rudolf Virchow. It is also known that all new cells come from an existing cell.
Cells were first named by the scientist Robert Hooke in the year 1665. The human body is known to contain trillions of cells. Although cells have similar organelles, they are programmed to serve different functions. Some cells produce hormones; some defend the body against foreign bodies, others transmit signals, and so on and so forth.
A group of cells that serve the same purpose are collectively called a tissue, and tissues that serve similar purposes are termed organs (such as heart, liver, and brain).
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