1. Nervous system
- The cell body of the nerve would be embedded to the spine
- On the other end (synaptic knob) of the nerve would be connected to the effector which in this case is the muscle fibers
- The electrical impulse or the nerve impulse is carried inside the walls from the cell body to the synaptic knot where it connects to the muscles through the axon which can be as long as one meter and only one cell wide.
- In mammals, the axon can be surrounded by another kind of cell known as the schwann cell - contains a great deal of fats and formed a myelin sheath, which helps increase the speed of nerve conduction and is one way of connecting the coordinator to the effector.
2. Hormone - Endocrine system
- Endocrine gland produces chemical known as hormone which can be proteins or steroids.
- Example adrenal gland which produces adrenaline. The hormone is secreted into the blood and travels through the stream and arrive at target tissue/ organ that will have an effect on.
- Hormones can have multiple target and brings about multiple effects.
Difference between Nerves and Hormones:
- Nerves transfer impulses much faster than hormone does
- Nerve impulses re sent through neurons whereas hormones are sent through blood.
- Nerve impulses enables body to response to external environment and the hormones enable body to respond to internal environment
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