The Nervous System
- Created by: BioFreakinomics
- Created on: 10-03-16 10:44
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- The Nervous System (NS)
- Reasons for responses
- To be able to suitable react to the constant changes in their internal & external environment
- E.G. escape predators, homeostasis etc.
- Somatic & Autonomic
- Somatic
- Motor neurones carry impulses to skeletal muscles
- Under voluntary (conscious) control
- Autonomic
- Role: independent of conscious control in order to control homeostatic mechanisms & stress response
- Structure: 2 neurones connecting the CNS to effectors => pre-ganglionic neurone & post-ganglionic neurone
- Most made of non-mylienated neurones
- Somatic
- Parasympathetic & Sympathetic
- Parasympathetic
- Most active during sleep & rest
- Brings about decreased heart rate & breathing rate, pupil constriction, decreased sexual arousal
- Sympathetic
- Most active in times of stress
- Brings about increased heart & breathing rate, pupil dilation, increased sexual arousal & ******
- Antagonistic systems
- Both systems are stimulated all the time but the balance of the stimulation alters depending on the situation
- Parasympathetic
- Reasons for responses
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