Term
Nervous System-
2 main systems |
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Definition
CNS
Central Nervous System
PNS
Peripheral Nervous System
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Term
CNS
Central Nervous System |
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Definition
Brain & Spinal Column-
receives information from the body and sends out instructions. Processing center-stores & instructs the whole body. Controls most of the bodily functions icluding awareness movements, sensations, thoughts, speech & memory. **some reflex movements can occur via spinal cord pathways without brain structures. |
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Term
PNS
Peripheral Nervous System |
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Definition
Nerves & wiring
PNS sends messages to & from the brain to the rest of the body.
Formed by all other parts of the nervous system, excluding the brain & spinal cord.
Nerve cells or neurons "wired together throughout body.
Neurons carry messages (electrical impulses) to keep body functioning. Unlike other body tissues, limited ability to repair themselsves due to damage from injury or disease. |
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Term
PNS--Peripheral Nervous System
Divided into 2 systems |
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Definition
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Term
Somatic System
(part of the Peripheral Nervous System) |
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Definition
| Carries messages to & from sense organs to the skeletal-muscular system guiding voluntary activities. |
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Term
Autonomic System
(part of the Peripheral Nervous System)
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Definition
Carries messages to & from internal organs & glands. Controls involuntary activities, "self governing activities"
(digestion, heart rate, breathing).We don't need to think about these, they just happen. |
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Term
Autonomic System
2 branches within
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Definition
- Sympathetic branch
- Parasynpathetic branch
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Term
Sympathetic Branch
(part of the autonomic System of the Peripheral Nervous System) |
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Definition
Emergency system, prepares for "FIGHT or FLIGHT" Stress response either by excitement or emergency. Helps us survive. Most overused in our modern lifestyle. Works full speed not only when emotionally upset but physically stressed.
- Increases heart rate
- Increases respiration
- Releases Adrenaline
- Liver releases sugar
- Inhibits elimination
- Inhibits digestion
- Activates sweat glands
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Term
Parasympathetic Branch
(part of the autonomic System of the Peripheral Nervous System) |
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Definition
Housekeeping system. Quiets the body, most active when the bodyis at rest.
keeps vital process (digestion, heart rate, etc. at a moderate level and conserves energy.
- Constricts pupils to protect retinas from excessive light.
- Lowers heart rate
- Constricts respiration
- Stimulates digestion
- Stimulates elimination
- Contracts bladder
- Stimulates tears
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