Responses can be controlled by nerves or hormonal control
1. Motor Nerve - located in the spine
- electrical/nerve impulses travel down the axon of the cell to the effector (e.g muscle)
- the schwann cells produce myelin sheath (fat) to increase the sphere of nerve conduction
2. Endocrine System
- produces hormones (proteins or steroids)
- made in the endocrine glands (e.g adrenal gland - adrenaline)
- hormone travels through blood
- travels to target tissue/organ
- hormones can have multiple targets and effects
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