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NadiaA

Motor Systems: Autonomic NS
LO:
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Describe the organisation of the autonomic nervous system
Describe the action of neurotransmitters
Outline the roles of sympathetic and parasympathetic divisions
Explain central nervous control of autonomic activity

Know how to draw the divisions of the nervous system
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Part of PNS
Regulates activity of visceral tissue
Motor system; delivers info via efferent neurons
Involuntary/autonomic
Role; homeostasis

Homeostatic regulation
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Have dual innervation; by the sympathetic and parasympathetic NS
The sympathetic and parasympathetic are antagonistic to each other, if one is dominant
over the other it will cause the effect
Basal tone- AP varies

Divisions of ANS:
1
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Parasympathetic NS- conservation of energy, replenishment of nutrient stores, “rest and
digest”
(Sympathetic is taking over when you are nervous, when you are in a fight or scary situation)
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Acetylcholine
 Ach travels in vesicles
Extra for understanding;
1
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3
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5
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7
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Sodium ion channels open
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A generator potential is created
11
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The neurotransmitter substance is usually ACh and will be broken down in into ethanoic acid and choline
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So in effect it is recycled
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Nicotinic acetylcholine receptors (cholinergic)
2
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Different neurotransmitter released at effector organ (PNS- Ach, SNS- norepinephrine)
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NadiaA

2
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Difference in length of post and pre ganglionic fibres (PNS- shorter post ganglionic neuron,
longer pre-ganglionic whereas in SNS- shorter pre- ganglionic, longer post-ganglionic)
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