In what ways are the autonomic nervous system and the somatic nervous system different?
1. The autonomic is a two-neuron system; the somatic uses one.
2. The autonomic uses smaller neuron fibers (type B or C); the somatic generally uses the type A fibers.
3. The autonomic is mostly involuntary and automatic; the somatic is voluntary.
4. The autonomic uses several neurotransmitters and many receptor types; the somatic uses only one.
5. The autonomic is a slow system; the somatic is a fast system.
6. The autonomic has opposing forces to regulate the body; the somatic does not.