Module 3 HW Questions Flashcards
Which group of neurotransmitters are fast acting and produced in the axon terminal?
small molecule
What are chemicals that can act as neurotransmitter agonist or antagonist?
neuromodulators
How do direct agonist modify the effect of a neurotransmitter?
mimic NT by binding to the same receptor
How does an indirect neurotransmitter agonist work?
blocks reuptake or increases production of NT
What type of substance interferes with production and/or the release of a neurotransmitter?
indirect antagonist
Which type of chemical prevents a neurotransmitter from binding to its receptor on the target cell?
direct antagonist
What products produce acetylcholine?
acetyl CoA and choline
What enzyme is required for the synthesis of acetylcholine?
acetyltransferase
Released acetylcholine is broken down into choline and acetate in the synaptic cleft by…
acetylcholinesterase
How is choline removed from the synaptic cleft?
actively pumped back into the presynaptic neuron
What are neurons called that produce acetylcholine?
cholinergic
Which neurotransmitter is produced and secreted by all somatic motor neurons?
acetylcholine
Which neurotransmitter is produced and secreted by all preganglionic parasympathetic and sympathetic neurons?
acetylcholine
Which neurotransmitter is produced and secreted by all postganglionic parasympathetic neurons?
acetylcholine
Which neurotransmitter is produced and secreted by postganglonic sympathetic neurons innervating sweat glands?
acetylcholine
What cation is responsible for the release of acetylcholine at a synapse?
calcium
What is an example of inhibitory muscarinic receptor location?
cardiac muscle
What is an example of excitatory muscarinic receptor location?
GI smooth muscle and eccrine sweat glands
Nicotinic cholinergic receptors are ______________, while muscarinic cholinergic receptors are _______________
ionotropic, metabotropic
Nicotinic receptors are always and only _______________ while muscarinic can be either excitatory or inhibitory
excitatory
What type of cholinergic receptor is located on all autonomic postganglionic neurons?
nicotinic
What type of cholinergic receptor is located on chromaffin cells in the adrenal medulla?
nicotinic
What type of cholinergic receptor is located on parasympathetic target cells and sweat glands?
muscarinic
What type of cholinergic receptor is located on the sarcolemma of skeletal muscle of NMJ?
nicotinic
What type of cholinergic receptor mediates fast EPSPs?
nicotinic
Which type of cholinergic receptor mediates slow EPSPs?
muscarinic
What is the main excitatory neurotransmitter in the CNS?
glutamate
How do neurons synthesize glutamate in the axon terminal?
krebs cycle
What happens to glutamate after it is released by the presynaptic axon terminal?
removed by nearby astrocyte
What happens to glutamate that is taken up by glial cells?
converted to glutamine
Where do neurons get their supply of glutamine to make glutamate?
nearby astrocyte
Which glutamate receptors produces fast EPSPs?
AMPA
Which glutamate receptor allows for the influx of calcium and sodium?
NMDA
Which CNS structure has a high conc. of NMDA receptors?
hippocampus
NMDA receptors require stimulation by both glutamate and _________ in the CNS
glycine
What ion blocks NMDA receptor channels?
magnesium
What membrane conditions can dislodge the ion block from the NMDA receptor?
depolarization
Which glutamate receptor is an NMDA receptor dependent on to function properly?
AMPA
What membrane conditions allow an ion to block the NMDA receptor channel?
RMP and/or hyperpolarization
What is the primary receptor involved in neuroplasticity?
NMDA
What is the primary ion involved in synaptic plasticity/learning?
calcium