NERVOUS SYSTEM
Central Nervous System
- spinal cord and brain
Peripheral Nervous System
- all nerves not encased in bone
- everything except the brain and spinal cord
- two categories: autonomic and somatic
Somatic
- controls voluntary muscle movement
- uses motor neurons
Autonomic
- controls automatic functions of the body
- two categories: sympathetic and parasympathetic
Sympathetic
- fight or flight response
- automatically accelerates heart rate, breathing, dilates pupils, slows down digestion
Parasympathetic
- automatically slows the body down after a stressful event
- heart rate and breathing slows down, pupils constrict and digestion speeds up
Reflexes
- normally sensory neurons take information up through the spine to the brain
- some reactions occur when sensory neurons reach just the spinal cord
Endocrine System
- similar to the nervous system, except hormones work a lot slower than neurotransmitters
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