The Human Body Your body is a wonderful thing. It has many systems, organs, cells etc... Each part controls a different part of your body and how it functions. I am going to tell you about all of the systems.
The PNS includes the nerves that connect the CNS to all parts of your body. It carries messages to and from the CNS. All parts of the nervous system are made up of special nerve cells called neurons. Neurons cannot replace themselves like the other cells. Once they've been destroyed, they can't replace themselves.
There are many systems one of them is the nervous system. The nervous system is the group of body parts that makes and sends the commands that control all your actions. There are many different parts of the nervous system. Like the central nervous system (CNS). The CNS includes the brain and the spinal cord.
It is the bodies main control center. There is also the peripheral nervous center (PNS). Another system is the respiratory system.
The respiratory system is the group of body parts that changes gases in order for the body to work properly. The respiratory system has two sections. The upper sections include your nose, mouth and windpipe. The lower section includes the lungs and two structures within the lungs the bronchi and the alveoli. The two lungs are the main organs of breathing. Lungs are elastic bodies one on each side of the heart. They are filled with millions of tiny air sacs called alveoli. The alveoli are at the end of the bronchi. The diaphragm is an important part to breathing. The diaphragm is a large muscle that separates the chest from the abdomen.
Another system is the skeletal system. The skeletal system is all the bones in the body.