PNS Flashcards
Neurotransmitter of Parasympathetic Nervous System is,
AcetylCholine
Ninth Cranial Nerve is,
Glossopharyngeal Nerve
Third Cranial Nerve is
Oculomotor Nerve
Seventh Cranial Nerve is
Facial Nerve
Physiological responses of the Parasympathetic Nervous System are collectively called the ———- response.
rest and digest
Physiological responses of the Sympathetic Nervous System are collectively called the ———- response.
Fight-or-flight
Tenth Cranial Nerve is
Vagus Nerve.
Effect of Sympathetic Nervous System is stimulant on all body parts except
Gastrointestinal Tract,
Neurotransmitter of Sympathetic Nervous System is
Adrenaline.(Epinephrine)
The vagus nerve regulates major elements of which part of the nervous system?
a) Parasympathetic nervous system
b) Enteric nervous system
c) Sympathetic nervous system
d) Central nervous system
a) Parasympathetic nervous system
Which of these is not a feature of postganglionic neurons in the sympathetic nervous system?
a) Originating distal to the effector organ
b) Unmyelinated
c) Short
d) Noradrenergic
c) Short
Activation of the sympathetic nervous system leads to the ‘fight and flight’ response. Which of these is not part of that process
a) Vasodilatation in skeletal muscle
b) Sweating
c) Bladder relaxation
d) Increased gut motility
d) Increased gut motility
What is the function of myenteric plexus?
Control digestive tract motility
What is the function of submucosal plexus?(Meissner’s plexus)
- Regulate GIT blood flow
2. Control epithelial cell function
Co-transmitters for excitatory neurons?
Ach and tachykinins
Co-transmitters for inhibitory neurons?
nitric oxide, vasoactive intestinal peptide (VIP) and ATP
What is co-transmitter?
a substance that is released from a nerve ending along with primary neurotransmitter in order to modify the action of the latter.
What causes anticholinergic toxidrome?
blocked muscarinic receptor thus prevent interaction with ACh
What anticholinergic toxidrome always associated with?
drug overdose,e.g. antihistamine,tricyclic antidepressant
What happens in cholinergic toxidrome?
over stimulation of cholinergic receptor (inhibition of AChesterase which breaks down ACh)
Adrenergic nerve fibre use which Nts?
E,NE,dopamine
Which nts are major in preganglionic nerve fiber?
ACh
which nts are major in sympathetic postganglionic nerve fiber
NE
NE and E are metabolised by what enzymes?
MAO(monoamine oxidase) , COMT( catechol-o-methyl transferase)
excitatory neuron causes what ?
it is a depolarizing neuron so it leads to release of nts and induce action potential
inhibitory neuron causes what?
hyperpolarizing neuron so it reduces release of nts and prevent action potential
