- Nerve impulse is carried along the inside of the nerve from the cell body to the Synaptic Knob where it connects to the muscle - causing it to extend or retract.
- The endocrine gland produces a chemical known as a hormone.
- The Myelin Sheath increases the nerve conduction between components.
- In mammals the axon is surrounded by a Schwann Cell (contains fat)
- Hormones can be proteins or steroids
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