The amazing world inside a human cell...
Cell Structure and Function What is a Cell? A cell is a structure as well as a functional unit of life-Every living thing has cells: bacteria, protozoans, fungi, plants, and animals are the main group of living things. Some organisms are made up of just one cell are called uni cellular. (e.g. bacteria and protozoans), but animals, including human beings, are multi-cellular. An adult human body is composed of about 100,000,000,000,000 cells! Each cell has basic requirements to sustain it, and the body's organ systems are largely built around providing the many trillions of cells with those basic needs (such as oxygen, food, and waste removal).
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