Sympathetic Nervous System & Trauma Flashcards
The central nervous system consists of the …. and …..
It controls the …..
Brain and spinal cord,
Controls the autonomic nervous system
What is ANS divided into?
The ANS acts …. and …..
Into the sympathetic and parasympathetic divisions
Acts automatically and subconsciously
Afferent nerves carry information from where to where?
S or P?
Signals from organs/tissues to CNS
Parasympathetic nerves
Efferent nerves carry signals from where to where?
P or S?
From CNS to organs/tissues
Sympathetic nerves
All preganglionic neurones are ……
They secrete
Are cholinergic fibres
Secrete acetylcholine
Where is the 1st sympathetic neurone?
In the particular spinal cord segment; thoracic and upper 2-3 lumbar segments
Where is the 2nd sympathetic neurone?
In the sympathetic ganglion, in a chain either side of the spinal column
Where do the sympathetic divisions supply?
Also …., …. and ….. (not on diagram)
Photo from notes
Skin, limbs and blood vessels
How are signals “switched off”?
E.g. Enzyme
Or how else transmitter removed?
By inactivating or removing the released transmitter
E.g. Cholinesterase
Or transmitter is recaptured by presumptive nerve terminals
What does cholinesterase break down?
What does it break it into?
Breaks down Ach
Into choline and acetate
What type of receptors do nor/epinephrine (nor/adrenaline) work on?
Alpha and beta receptors
What type of receptors are alpha and beta receptors?
What response does stimulation produce?
G protein coupled receptors (GPCR)
Intracellular messengers
Where is norepinephrine released from?
Nerves
Where is epinephrine released from?
Adrenal gland
How do norepinephrine vs epinephrine stimulate alpha and beta receptors?
Norepinephrine stimulates alpha receptors more than beta receptors
Epinephrine stimulates both the same
