Cell Biology

The cell is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life that can replicate independently, and cells are often called the "building blocks of life". The study of cells is known as cell biology.

The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells contain the body’s hereditary material and can make copies of themselves. Cell is the basic structural and functional unit of all organisms; they may exist independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals.