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Autonomic Nervous System

Ans anatomy mixed composition of the autonomic nerves

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Unformatted text preview: s Active in “rest and digest” phase Increase GI activities Decrease heart rate and BP SNS dominance: Fight or Flight Prepare for emergency, stress, exercise Increase heart rate and BP Mobilize energy stores Pupillary dilation Decrease GI and urinary Normal regulation of BP upon standing up. ANS: Anatomy Mixed composition of the autonomic nerves- Long thought that the nerves of the ANS had only efferent fibers Only efferent fibers are truly part of the ANS; ANS if efferent (effector) by definition Nerves of ANS are actually mixed nerves, many contain afferent fibers Vagus nerve actually has more afferent that efferent fibers Afferents transmit information from visceral receptors to CNS, maintain homeostasis Somewhere in the CNS there will be a preganglionic neuron, as the ANS is based on ganglia. In the ganglion: dendrites, neural synapse, cell body Efferent ANS Anatomical Considerations Two neurons in series from CNS to effector organs Preganglionic, postganglionic neuron Synapses located in autonomic ganglia FINISH PNS: Anatom...
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