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The human body is made up of around 60 trillion cells, which work together to keep us alive and functioning properly. These cells are incredibly tiny, measuring only about 1/100th the size of a grain of sand. But despite their small size, they play a huge role in our overall health and well-being. Cells are the basic building blocks of our bodies, and they come in many different shapes and sizes. Some cells are specialized to do specific jobs, like muscle cells that help us move or nerve cells that allow us to think and feel sensations. Other cells are more general-purpose, like skin cells that protect our bodies from harm. Cells also have a special membrane called the cell wall, which helps keep them safe and healthy. The cell wall is made up of layers of protein and fat, which provide strength and support to the cell. Inside the cell, there are many different organelles that help carry out important jobs like producing energy or getting rid of waste. Despite their incredible complexity, cells are surprisingly fragile. They can be damaged by things like infections, injuries, or even just plain old wear and tear. When this happens, it's up to our immune system to repair the damage and keep us healthy. Overall, the human body is made up of an amazing array of cells that work together to keep us alive and functioning properly. By understanding how these cells work, we can gain a deeper appreciation for the incredible complexity and beauty of the human body.