The Nervous/Endocrine System
by: Mitchell Horn period 6
The nervous system is the most complex system. The brain and spinal cord are the central nervous system (CNS). The connecting nerve processes to effectors and receptors that serve as the peripheral nervous system (PNS). The brain stem connects the cerebrum and cerebellum to the spinalcord. The mid brain is the center for visual and auditory reflexes for example blinking and adjusting the ear to sound volume. The middle section, the pons, bridges the cerebellum hemispheres and higher brain centers with the spinal cord. Below the pons lies the medulla oblongata,it contains the controlcenters for swallowing, breathing, digestion, and heartbeat.
It may seem as if your brain is always on the go. And it is. The brain not only controls what you think and feel, how you learn and remember, and the way you move and talk, but also many things you're less aware of — such as the beating of your heart, the digestion of your food, and yes, even the amount of stress you feel. Like you, your brain is quite the juggler.
If you think of the brain as a central computer that controls all bodily functions, then the nervous system is like a network that relays messages back and forth from the brain to different parts of the body. It does this via the spinal cord, which runs from the brain down through the back and contains threadlike nerves that branch out to every organ and body part.
The biggest part of the brain is the cerebrum. The cerebrum makes up 85% of the brain's weight. The cerebrum is the thinking part of the brain and it controls your voluntary muscles — the ones that move when you want them to. So you can't dance — or kick a soccer ball — without your cerebrum.
Ever dozed through chemistry class and wondered what chemistry had to do with you? A lot! Your body produces its own chemicals and uses them to control certain functions, and the main system that coordinates these chemicals is called the endocrine system. Although we rarely think about the endocrine system, it influences almost every cell, organ, and function of our bodies. The endocrine system plays a role in regulating mood and growth.
Sensory nerves gather information from inside the body and the outside environment. The nerves then carry the information to central nervous system. Neurons in the brain communicate via electrical impulses and neurotransmitters.