What are cells are all living things made up of Cells
Every living organism is made up of cells from plants to the lowliest worm to the most complex human being, But what is the cell
Well a cell is a small self contained unit within a whole organism kind of like a room within a house, It is the smallest unit that can be classified as a living thing
We can think of them as the building blocks of life so how many cells do you think you have in your body a thousand a million a million million more, We contain around 50 trillion cells have a look at your little finger there's probably about 10 billion cells in now selves come in all different shapes and sizes occasionally
Cells can be large enough to be seen by the human eye for example the yolk of a chicken egg is actually a single cell and some cells are really long such as a nerve cell that runs the entire length of your spine
However most cells are really really tiny and can only be seen under a microscope they are so tiny that you could fit about 10 of them across one of your hairs
Now there are many different types of cells and each cell carries out its own jobs some of these jobs are common to all cells such as making proteins and producing energy
While some jobs are specific to the type of cell a human sperm cell has to be able to swim while the cells have produced a peacocks tail must produce beautiful colored pigments
Sometimes cells can exist on their own such as a simple bacterium or a single celled organism called an amoeba, But mostly cells work together to form more complex multicellular organisms such as animals plants and insects in a multicellular organism as well as doing its own jobs each cell also works together with the other cells around it to carry out an overall job
For example the cells of the heart work together to pump blood around your body so cells come in all shapes and forms and have all sorts of jobs
But they are all fundamental building blocks of living organisms
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