Body Building Blocks
The human body is amazingly complicated.
It's made up of hundreds of different organs tubes tendons tissues and other body parts
each with its own job to do.
In turn these parts are made up of millions of microscopic units which is called cells.
In addition, inside cells are the smallest body parts of all-the genes that make us human.
They tell cells how to do all the things
they need to do to make our bodies
work and keep us alive.