Organization in the human body

Our bodies are very organised, because without them, we would die.

There is a hierarchy of organisation for our bodies, and they are: the Cells, Tissues, Organs, and Organ systems. 

Cells are the smallest unit of life on this planet, being small and specialised to take on tasks.
Tissues are large groups of specialised cells and often coat large amounts of space on our bodies, like the tissues in our mouths, and the tissues that form when we hurt we hurt ourselves, named scar tissues.

Organs and Organ Systems are for well, what they are named; these organs are often known as the Lungs, Kidneys, your Heart, and other organs. 

Organ systems are systems of organs that work together to perform functions. 

One of them is the respiratory system, which works so that you can breathe.
The respiratory system works is the diaphragm contracting to allow air to enter the nose, and the air flowing through the Trachea, which is the windpipe, then it goes into the lungs.