ANS Flashcards
The ANS is a division of the…
PNS/efferent NS.
Sympathetic nerves have…
- thoracolumbar outflow
- short preganglionic and long postganglionic fibres
Sympathetic ganglia are located in…
- prevertebral ganglia
- paravertebral ganglia
Which 4 CN’s carry parasympathetic fibres?
- oculomotor
- facial
- glossopharyngeal
- vagus
In the sympathetic NS the synapses between pre- and post- ganglionic cells are…
- cholinergic and nicotinic
In the parasympathetic NS the synapses between pre- and post- ganglionic cells are…
- cholinergic and nicotinic
In the parasympathetic system, synapses between post-ganglionic cells and their targets are…
- cholinergic and muscarinic
Post-ganglionic cells in the adrenal medulla…
- release adrenaline
- have no axons - release A directly into the blood
- are part of the sympathetic NS
- contribute to mass activation
A and NA act on…
- adrenergic receptors
- alpha receptors
- beta receptors
ACh acts on…
- nicotinic receptors
- muscarinic receptors
In the eye, activation of the sympathetic system causes…
- contraction of the radial muscle of the iris (dilator)
- relaxation of the ciliary muscle of the lens
Eye drops used to dilate pupils for an eye examination may contain…
- a muscarinic antagonist
- an alpha-1 agonist
In the heart parasympathetic activation causes…
- release of ACh
- decrease in HR
In blood vessels activation of sympathetic nerves causes…
Vasoconstriction.
In some blood vessels, activation of the sympathetic system causes vasodilation because…
- they express B2 receptors
