chapter 16 Flashcards
autonomic nervous system is part of the
motor division of the PNS
subdivisions of the autonomic NS
sympathetic and parasympathetic
what does the autonomic NS do
maintains homeostasis by regulating unconscious activity: smooth and cardiac muscle and glands
constant response to change
ANS shunts blood to needy areas, increase or decrease HR, adjusts BP and temp and increases or decreases stomach secretions & role in sexual arousal and urinary functions
how many neurons are in somatic motor neurons
1
cell body is located in what division of the NS
CNS
the axon extends from CNS to
skeletal muscle
neurotransmitter in somatic motor neurons=
acetylcholine and always excitatory
autonomic motor neurons (how many)
2
what are the two types of autonomic neurons
preganglionic and postganglionic
1st neuron in the series of autonomic motor
preganglionic
in the preganglionic neuron the axon extends to
autonomic ganglion and synapses with postganglionic neurons
whats the neurotransmitter in the preganglionic neuron
Ach
whats the second neuron in the series
postganglionic neuron
cell body is where in the postganglionic neuron
autonomic ganglion in the pns
the synapse area of the postganglionic neuron contains
cell bodies of motor neurons
the axon of the postganglionic neuron extends to
effector and synapse with target tissues
what are the two subdivisions of the autonomic nervous system
sympathetic and parasympathetic
both the sympathetic and parasympathetic innervate the same
visceral organs
innervating the same visceral organs=
opposite effects
one stimulates and the other does what in ANS
inhibits
fight or flight, activates when increased physical activity or stress
sympathetic
rest and digest, activates when at rest
parasympathetic
what is the third subdivision of ANS
enteric
complex network of neuron cell bodies and axons within digestive tract walls
enteric
life threatening sitation would cause
fight or flight response
where is fight or flight response
thoracolumbar division of spinal cord (T1-L2), short preganglionic fibers
rapid hr/ force of contraction, elevated/deep RR, dry mouth, cold/sweaty skin, dilated pupils, sexual activity, reduces nonessential activity
fight or flight
2 types of sympathetic ganglia
sympathetic chain ganglia
collateral ganglia
shunting of blood to skeletal muscles and heart
fight or flight
fight or flight dilates bronchioles which
increases oxygen delivery to cells
fight or flight stimulates liver to release
glucose into blood
what is part of the e division
exercise, excitement, emergency, embarrassed
where is sympathetic chain ganglia located
L and R sides of vertebrae
what else is the sympathetic chain ganglia also called
paravertebral ganglia
what does the sympathetic chain ganglia exit via (4)
spinal nerves
sympathetic nerves
splanchnic nerves
adrenal gland medulla
to skin and skeletal muscles bvs
spinal nerves
to thoracic cavity
sympathetic nerves
sympathetic to collateral to effectors
splanchnic nerves
pass thru ganglia, synapse in medulla
adrenal gland medulla
unpaired ganglia in abdominopelvic cavity also called prevertebral ganglia
coollateral ganglia