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Human Anatomy 2.5

Autonomic Nervous System

TermDefinition
Somatic nervous system includes: Both sensory (touch) and motor (skeletal muscles) neurons. (voluntary).
Autonomic nervous system: Receives input from sensory receptors in organs, blood vessels, and nervous system. (involuntary).
Preganglionic neuron (ANS) Cell body, axon extending from central nervous system to autonomic ganglion.
Postganglionic neuron (ANS) Unmyelinated axon extending from ganglion to effector.
Preganglionic neurons and postganglionic neuron connect at: Synapse.
Synapse bulb sends, what receives? Dendrite spines.
Sympathetic nervous system Increased alertness and metabolism.
Parasympathetic nervous system Slows down most body activity.
Cholinergic neuron release: The neurotransmitter acetylcholine. Nicotinic receptors and muscarinic receptors.
Adrenergic neurons release: Norepinephrine.
SNS does what to cardiac muscle? Increase heart rate and force atrial and ventricular contractions.
PNS does what to cardiac muscles? Decreased heart rate and decreased force of atrial and ventricular contractions.
SNS does what to the stomach and intestines? Decrease motility and tone, contraction of sphincters.
PNS does what to the stomach and intestines? Increase motility and tone, relaxation of sphincters.
SNS does what to the pancreas? Inhibits secretion of digestive enzymes and insulin, promotes secretion of glucagon.
PNS does what to the pancreas? Secretion of digestive enzymes and insulin.
What occurs to body during fight-or-flight? Airway diameter, heart rate and blood pressure increases, blood vessels dilate.
Created by: LaurenNeer
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