22 Flashcards
Sympathetic nervous system functions as
The emergency or stress system
Parasympathetic preganglionic nuerons have
Dendrites and cell bodies in the gray matter of the CNS (specifically in the brainstem and sacral segments of the spinal cord) - cranio-sacral NS
Axons of parasympatheti preganglionic neuron extend
Considerable distance away from the CNS before synapsing with a postganglionic neuron
Dendrites and cell bodies of parasympathetic postganglionic neurons are located in
Parasympathetic ganglia, which are located in or near autonomic effectors
Parasympathetic preganglionic neurons synapses w/ post ganglionic neurons that each lead
To a single effector
PNS function
Dominates control of most visceral effectors (organs) under normal every day conditions
Usually involves response by only one organ
The fibres/axons of each division of the ANS are classified according to
The type of neurotransmitter released by the axon terminal at the synapses
Two types of ANS fibres
Adrenegic fibres
Cholinergic fibres
Adrenergic fibres release ________
And are the axons of most __________
Noradenaline
Postganglionic sympathetic neurons
Cholinergic fibres release
Acetylcholine
Cholinergic fibers include a
axons of preganglionic sympathetic neurons
axons of preganglionic and postganlionic parasympathetic neurons
a few sympathetic postganglionic fibres are cholinergic
The effect of a nuerotransmitter on any postsynaptic neuron is determined by
Characteristic of the receptors not by the neurotransmitter
Acetylcholine from parasympathetic NS ____ the heart
Slows
Noradrenaline from the sympathetic NS ________ the heart
Speeds up
The ANS is independent from other parts of body T/F
False
