biology 322 human anatomy i autonomic nervous system
TRANSCRIPT
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Biology 322Human Anatomy I
Autonomic Nervous System
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Autonomic Nervous System
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The efferent (motor) component of the peripheral nervous system includes two types of neurons:
Neurons
Neurons
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Comparison: Somatic vs Autonomic efferent neurons
Somatic
Autonomic
Voluntary Involuntary Effectors: Skeletal M. Effectors: Cardiac M. Smooth M Glands
Neurons extend from CNS to effectors without synapsing.
Two neurons to get from CNS to effectors; Therefore one synapse."Two neuron chain"
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Autonomic Nervous System
Two divisions based on: a) b)
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Division of Autonomic Nervous System Preganglionic neuron starts
Preganglionic neuron synapses
Division of Autonomic Nervous System Preganglionic neuron starts
Preganglionic neuron synapses
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Sympathetic Division Synapse between preganglionic neuron and postganglionic neuron can occur in either of two sets of ganglia
1)
2) .
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Sympathetic Ganglia
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Sympathetic Ganglia
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Parasympathetic Division Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:
1.
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Parasympathetic Division Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:
2.
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Parasympathetic Division Synapse between preganglionic and postganglionic neurons occurs in ganglia very close to the target cells:
2.
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Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.
Sympathetic:
Parasympathetic:
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Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.
For example:
Heart: Sympathetic increases heart rate & force of contraction Parasympathetic decreases heart rate & force of contraction
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Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.
For example:
(Heart: Sympathetic increases rate & force Parasympathetic decreases rate & force )
Lungs: Sympathetic dilates air passages Parasynpathetic constricts air passages
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Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.
For example:
(Heart: Sympathetic increases rate & force Parasympathetic decreases rate & force )(Lungs: Sympathetic dilates air passages Parasynpathetic constricts air passages)
Digestive System: Sympathetic decreases activity; constricts anal sphincter Parasympathetic increases activity; relaxes anal sphincter
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Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.
For example:
(Heart: Sympathetic increases rate & force Parasympathetic decreases rate & force )(Lungs: Sympathetic dilates air passages Parasynpathetic constricts air passages)(Digestive System: Sympathetic decreases activity Parasympathetic increases activity)
Urinary System: Sympathetic inhibits urination Parasympathetic promotes urination
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Most organs have both sympathetic and parasympathetic innervation, each of which acts in opposition to the other.
For example:
(Heart: Sympathetic increases rate & force Parasympathetic decreases rate & force )
(Lungs: Sympathetic dilates air passages Parasynpathetic constricts air passages)
(Digestive System: Sympathetic decreases activity Parasympathetic increases activity)
(Urinary System: Sympathetic inhibits urination Parasympathetic promotes urination)