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Sympathetic nervous system
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- 1Give the role of the sympathetic nervous system?fight or flight to increase readiness for activity
- 2Name the 2 regions when cell bodies of the SNS preganglionic neureiones lie?Thoracic and lumbar regions on Spinal cord
- 3Give the length of pre ganglionic neurones of SNS?short
- 4Give the length of postganglionic neurones in SNS?long
- 5Describe how the preganglionic neurones in SNS are arranged?create a sympathetic chain
- 6Name the 3 end points for preganglionic neurones in SNS?Paravertebral sympathetic chain
prevertebral ganglia/plexus
adrenal medulla - 7Describe the arrangement of the neurones in the paravertebral sympathetic chain?both pre and post ganglionic neurones can run up and down before synapsing
- 8Name the 3 main prevertebral ganglia where the preganglionic neurones synapse?Coeliac, super mesenteric and hypogastric
- 9Describe the pathway of pregangliuonic fibres to the adrenal medulla?from 10th and 11th segment run in greater splanchnic nerve and synapse in chromaffin cells of adrenal gland medulla
- 10In the most common sympathetic neuroeffector pathway, give the neurotransmitter and receptors?Paravertebral ganglia = ACh at nicotinic receptor
Effector synapse = Noradrenaline at adrenoreceptors - 11What type of receptors are the nicotinic and adrenoreceptors?Nicotinic = ionotropic
Adrenoreceptors = GPCR - 12Name 4 target muscles of the most common pathway?endocrine and exocrine glands
smooth muscle
cardiac muscle - 13Describe the paravertebral ganglia pathway?nicotinic ACh receptors
Muscarinic ACh receptors - 14Give the effectors that have muscarinic ACh receptors?sweat glands
- 15Describe the pathway of the adrenall medulla ?nicotinic ACh receptors
Adrenoreceptors and Adrenaline and noradrenaline into blood - 16Describe the process of Noradrenaline release at the effectors?adrenergic viscosity contains tyrosine which is used to synthesise NA for release into synapse
- 17What are the 2 types of receptors for noradrenaline?Alpha or beta adrenoreceptors
- 18How is Noradrenaline recycled?NA can be re-uptaken and broken down by Monoamine Oxidase (MAO)
- 19What type of receptors are adrenoreceptors?metabotropic
- 20Give the role of alpha adrenoreceptors?receptor of postsynaptic cell (triggers G protein)
alpha 2 helps take up NA back into cell ( regulatory) - 21Give the role of beta adrenoreceptors?triggers G-protein and enzymes
- 22Name 3 adrenoreceptor agonists ofSNS?Noradrenaline, adrenaline and isoprenaline
- 23Give a beta adrenoreceptor antagonist?beta blockers
- 24Describe sympathetic control of pupil diameter?NA binds to alpha adrenoreceptors on radial muscle to cause contraction (MYDRIASIS pupil dilates)
- 25Name a mydriatic drug and its effect onthe pupil diamteter?sympathomimetic
- mydriasis ( pupil dilates) - 26—
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- University Human Physiology Fichas sobre Sympathetic nervous system, creado por Clare Fairclough el 05/03/2026.
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- Clare Fairclough
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