Cells are the building blocks of all living organisms. Every cell in our body performs specific functions essential to survival, from energy production to protein synthesis. The human body is made up of trillions of cells, each specialized for different tasks. For example, red blood cells transport oxygen, while nerve cells send signals throughout the body.
The structure of cells is complex, with various organelles like the nucleus, mitochondria, and ribosomes performing distinct tasks. Understanding cell functions is vital in fields like medicine, as many diseases arise from malfunctioning cells.