UPSC,PCS,CDS,NDA & SSC Examinations.
A substance that binds to a receptor is known as
1.a Carlsson mediator
2.a ligand
3.an anti-telharsic inhibitor
4.a gluon
Posted Date:-2023-11-23 16:07:20
A typical synaptic cleft is
1.40 nm wide
2.60 nm wide
3.80 nm wide
4.20 nm wide
Posted Date:-2023-11-23 16:11:38
Neurons are specialized to receive, conduct and transmit
1.electrochemical signals
2.action potentials
3.electrical signals
4.chemical signals
Posted Date:-2023-11-22 17:08:05
Once released, neurotransmitter molecules typically produce signals in postsynaptic neurons by
1.entering the postsynaptic neuron
2.attaching to vesicles
3.binding to presynaptic receptors
4.binding to postsynaptic receptors
Posted Date:-2023-11-23 16:01:57
The abbreviation 5-HT stands for
1.serotonin
2.dopamine
3.acetylcholine
4.tryptophan
Posted Date:-2023-11-23 16:04:45
The end of the rising phase of an action potential occurs when the
1.potassium channels close
2.sodium channels close
3.potassium channels open
4.chloride channels open
Posted Date:-2023-11-22 18:08:42
A membrane potential is the difference in electrical charge between
1.potassium and sodium ions
2.the inside and outside of the cell
3.phosphoric acid and glycolipid layers
4.resting and action potentials
Posted Date:-2023-11-22 18:06:41
A neuron fires when
1.there is an excitatory postsynaptic potential (EPSP)
2.hyperpolarization occurs at the axon hillock
3.neurotransmitters dock onto receptor proteins
4.depolarization at the axon hillock exceeds the threshold for excitation
Posted Date:-2023-11-22 18:07:53
After release, most neurotransmitters are deactivated by
1.reuptake
2.postsynaptic receptors
3.enzymes
4.buffered diffusion
Posted Date:-2023-11-23 16:03:39
An adult brain contains roughly how many neurons?
1.10 million
2.10 billion
3.100 million
4.100 billion
Posted Date:-2023-11-22 17:58:44
Antipsychotic drugs given for schizophrenia and psychosis are.
1.selective serotonin reuptake inhibitors
2.acetylcholine agonists
3.postsynaptic dopamine antagonists
4.testosterone antagonists
Posted Date:-2023-11-23 16:10:43
Drugs that facilitate the activity of a synapse of a particular neurotransmitter are said to be ______ of that neurotransmitter.
1.agonists
2.antagonists
3.autoreceptors
4.endorphins
Posted Date:-2023-11-23 16:06:33
Exogenous substances
1.originate within the body
2.are released via exocytosis
3.are natural neurotransmitters
4.originate outside the body
Posted Date:-2023-11-23 16:08:05
Interactions between neurons commonly occur across junctions called
1.synapses
2.juxtapositions
3.presynaptic membranes
4.postsynaptic membranes
Posted Date:-2023-11-23 15:56:12
Microdialysis is a technique used to measure
1.action potentials
2.inhibitory postsynaptic potentials
3.neurotransmitters
4.brain waves
Posted Date:-2023-11-23 16:08:42
Most of a neuron’s DNA is contained within its
1.cytoplasm
2.axon
3.nucleus
4.endoplasmic reticulum
Posted Date:-2023-11-22 17:21:16
Neurotransmitter release occurs through the process of
1.excitation
2.exocytosis
3.pinocytosis
4.synthesis
Posted Date:-2023-11-23 15:58:23
Neurotransmitters are often stored in
1.synaptic buttons
2.microtubules
3.vesicles
4.endoplasmic reticulum
Posted Date:-2023-11-22 18:09:46
What effect does myelination have on axons?
1.it protects them from damage
2.it slows the propagation of signals along them
3.it prevents cross talk between adjacent axons
4.it allows them to conduct signals significantly faster
Posted Date:-2023-11-23 15:55:12
What part of a neuron is sometimes myelinated?
1.dendrite
2.axon
3.soma
4.axon hillock
Posted Date:-2023-11-22 16:16:53