29.4 central and peripheral nervous systems key concept the central nervous system interprets...
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29.4 Central and Peripheral Nervous Systems
KEY CONCEPT The central nervous system interprets information, and the peripheral nervous system gathers and transmits information.
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29.4 Central and Peripheral Nervous Systems
The nervous system’s two parts work together.
• The CNS includes the brain, brain stem, and spinal cord.• The PNS includes four systems of nerves.
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29.4 Central and Peripheral Nervous Systems
• The CNS and PNS pass signals between one another.
1. PNS stimulates a response.
2. PNS passes impulse to CNS.
3. CNS interprets impulse.
4. CNS passes impulse to PNS.
5. Sensory receptor generates impulse
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29.4 Central and Peripheral Nervous Systems
The CNS processes information. • The brain has three parts.
– cerebrum controls thought, movement, emotion
- Details: is biggest part of brain, what you think of when you see a brain
– cerebellum allows for balance
- Details: at base of brain, looks like cauliflower midbrain
pons
medulla oblongata
– brain stem controls basic life functions
– Details: has midbrain, pons and medulla at top of spinal cord
Brainstem
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29.4 Central and Peripheral Nervous Systems
• The brain stem has three parts.
– midbrain controls some reflexes
– pons regulates breathing – medulla oblongata controls
heart function, swallowing, coughing
midbrain
medulla oblongata
pons
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29.4 Central and Peripheral Nervous Systems
• The spinal cord controls reflexes.
– sensory neuron sends impulse to spinal cord– spinal cord directs impulse to motor neuron – does not involve the brain
interneuron
motor neurons
sensory neuron
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29.4 Central and Peripheral Nervous Systems
The PNS links the CNS to muscles and other organs.
• 1. The somatic nervous system regulates voluntary movements– Details: your moving and motor neurons
• 2. autonomic nervous system
controls involuntary, functionsDetails: breaks into
sympathetic/parasympathetic
3. sympathetic nervous system: “fight vs. flight”-Details: adrenal gland
4. parasympathetic nervous system: calms the body, -Details: conserves energy , body at rest…