Nervous System

The nervous system responds to the body and enviroment; controls all functions of your body. The nervous system is broken down in two parts. The first one is your central nervous system. This one is your brain and spinal cord. This one responds to any messages you systems coming from the other part of the nervous system, the peripheral nervous system. This one includes all of the parts except for the brain and spinal cord. It connects all the parts of the bdies to the CNS. The PNS uses specialized structures called nerves to carry the information. In fast electrical energy nuerons carry these messages. Those fast moving messages are called impulses. The neurons have dendrides, which are especially short extensions of the cell. Dendrides are what brings the information in to the neurons. Axons are what takes them away. Sensory neurons collect information of what is going on in and outside of your body. Receptors are what detect the changes. The neuron that sends impulses to the tissue glands from the spinal cord are motor neurons. Almost all of the neurons that are under the somatic nervous system are under conscious control. They control voluntary movemonts such as writing and smiling. The autonomic nervous system does things you don't think about, like digesting food. Its manin roll is to keep everything in balance. Sympathetic nervous system and the parasympathetic work together in the autonomic system to keep a stable internal enviroment called homeostasis. The largest and main organ in the nervous system is the brain. It does invountary things and voluntary things. The largest part of the brain is called the cerebrum. It holds your voluntary movements in there. It is where most of your memories are kept. It divodes into two hemispheres. The left side controls the right and the right controls the left. The second largest part of your brain is the cerebellum. It lies below the cerebrum. This is what keeps your form. Such as when you lose your balnce, it sends messages. The medulla is what connects to the spinal cord. You can't live without it. The medulla controls invountary actions, such as blood pressure and heart rate. It recieves information from the receptors to send out impulses if your body is too cold or warm.