Video narration
A human body cell is the basic unit of life—like a tiny living room where the work of your body happens. Around the outside is the cell membrane, a flexible skin that protects the cell and controls what enters and leaves. Inside is cytoplasm, a jelly-like fluid that holds the cell’s parts and is where many jobs take place. The nucleus is the control center; it stores DNA, the instructions that tell the cell how to grow and what to do. And mitochondria are the power plants: they turn nutrients and oxygen into usable energy so the cell can move, build, and repair. Working together, the membrane brings in supplies, the cytoplasm supports activity, the nucleus directs the plan, and the mitochondria provide power—keeping the cell alive and able to do its specific job.