Central Nervous System
- Consists of the brain and spinal cord.
- Receive, interpret, and send signals to the peripheral nervous system. The CNS may also store some messages for later use.
- A nerve fiber or axon, which is part of a neuron , is a long extension that carries electrical messages away from the cell body and passes them to other cells.
- The nerve fibers are coated or surrounded by what is called a myelin sheath. Myelin is a layer composed mostly of lipid with some protein that electrically insulate and protect the nerve fibers.
- The messages transmitted to the brain tell the body what to do.
- A normal central nervous system is necessary for the body to carry out the most simple and complex life functions.
- This system protects the body from illness, and fights off infections and pathogens.
- The immune system finds the harmful cells and destroy it from the body.
- The system is a huge network of white blood cells.
- The immune system responds to different pathogens.
- Specific responses occur at a cellular level and a different for each pathogen.
- Nonspecific responses are those that happen in the same way to every pathogen.
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