M3 Autonomic Nervous System Flashcards
controls the voluntary actions and convery sensory information
somatic ns
controls involuntary actions and regulates the viscera, vasculature, and glands
Autonomic ns
- act in conjunction w/ visceral motor fibers to control visceral functions
- carry sensory information from viscera to cns
visceral sensory fibers
- related to special sensory senses
- not classified on both ans od sns but can modulate sns
special sensory fibers
- regulates homeostasis and reproduction
- activity of internal organs and vasculature
- circulation, respiration, digestion, metabolism, secretions, body temperature, and reproduction
Autonomic NS
respond to pressure and to stretch
mechanoreceptors
sensitive to chemical concentrations in the blood
chemoreceptors
typically most responsive to stretch, ischemia, and pain stimulus
nociceptors
hypothalamus responds to very small changes in the temperature of circulating blood
thermoreceptors
respond to external temperature changes
thermoreceptors
information from visceral receptors enters the central ns by two routes
afferent pathways
two routes of afferent pathways
spinal cord and brainstem
involved in regulating respiration
pons
regulate heart rate, respiration, vasoconstriction, and vasodilation
medulla
is often achieved by integrating info from peripheral afferents with info from receptors within the cns
autonomic regulation
classified as sympathetic and parasympathetic
efferent pathways
connections from the cns to autonomic effectors use a two neuron pathway
efferent pathways
neuron extending from the central ns
pre ganglionic
the neuron connecting the ganglion with the effector organ
post ganglionic
secretes the neurotransmitter acetylcholine, norepinephrine, epinephrine.
autonomic neurons
neuron that secrete acetylcholine are called?
cholinergic
neurons that secrete norepinephrine or epinephrine are called?
adrenergic
the chemical released by all presynaptic autonomic neurons?
acetylcholine
receptors on all post ganglionic neurons are?
nicotinic
sympathetic post ganglionic neurons release?
norepinephrine
adrenal medulla releases?
epinephrine
postganglionic parasympathetic neurons release
acetylcholine
activated by a muscarine- a poison from mushrooms
muscarinic receptors
activate through nicotine from the tobacco
nicotinic acetylcholine receptors
part of the sympathetic system, is specialized to release epinephrine and norepinephrine directly into the blood
adrenal medulla
receptors that bind norepinephrine or epinephrine
adrenergic receptors
main role is the optimal blood supply in the organs
sympathetic ns
