Synapses Flashcards Quizlet PDF

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Study materials including terms and definitions based on my notes from lecture...

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8/29/2021

Synapses Flashcards | Quizlet

Synapses Terms in this set (48) Of the events which occur at

binding of the neurotransmitter to receptors on the

the chemical synapse, which

sub-synaptic membrane

happens last?

Spatial and temporal

both EPSPs and IPSPs

summation can occur during

The Synapse in presynaptic

axon to axon synapse

inhibition and presynaptic facilitation is which

Which neurotransmitter is

norepinephrine

removed from the synapse mostly by reuptake into the presynaptic knob?

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What of the following is

Synapses Flashcards | Quizlet

gap juntions

associated with electrical synapses? -paracrines -hormones -neurotransmitter chemicals -gap junctions

The initial segment of the

is; has many

neuron _____ normally the site of action potential initiation because it ______ voltage gated Na+ channels

1. action potential in synaptic knob 2. opening of the synaptic knob Ca++ channels Events at the synapse in proper

3. transmitter release into synaptic cleft

order

4. binding of transmitter to receptors on the subsynaptic membrane 5. postsynaptic potential in postsynaptic cell

The way neurotransmitters

diffusion

move across the synaptic cleft to bind with receptors on the postsynaptic cell is by

What are ways to prevent a NT

-broken down by enzymes

from restimulating a

-NT gets taken back up into presynaptic neuron

postsynaptic neuron?

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What is not associated with

depolarization

IPSPs? - GABA -depolarization -increased K+ permeability

An action potential occurs in

the neuron membrane is depolarized to threshold

the postsynaptic neuron if _______.

The relationship in which many

convergence

presynaptic neurons have synapse with one postsynaptic neuron is called __________.

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-serotonin Examples of neurotransmitters

-dopamine -norepinephrine

IPSPs _________ be summed

T/F The postsynaptic neuron

can

false

sums up all the signals coming to it which then must result in the formation of at least one action potential

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The trigger zone of the initial

Synapses Flashcards | Quizlet

more

segment is the site of action potential initation because it has __________ voltage-gated Na+ channels compared to toher areas of the neuron

_________ synaptic knob(s) fire(s)

one

action potentials during temporal summation

T/F the function of the IPSP is

false

to cause action potentials

T/F Acetylcholinesterase is an

true

enzyme on the postsynaptic membrane that breaks down acetylcholine

What events occurring at the

opening of the synaptic knob voltage gated Ca++

synapse happens first?

channels

1. diffusion of transmitter across synaptic cleft 2. NT release into synaptic cleft 3. binding of the NT to chemically gated channels 4. opening of the synaptic knob voltage gated Ca++ channels

Gap junctions are associated

electrical synapses

with

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What is must to occur during

Synapses Flashcards | Quizlet

depolarization

an EPSP? -increased K+ permeability - an action potential -depolarization -hyperpolarization -increased cell Clpermeability

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Calcium ion movement into the

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release of NT into the synaptic cleft

synaptic knob of the presynaptic neuron causes what?

T/F The norepinephrine or

false

acetylcholine molecules released ata synpase are not normally broken down or removed from the synapse, but are allowed to build in conc. so there is continual re-stimulation of the postynaptic cell

Spatial summation occurs

when different synaptic knobs fire at the same time to cause summation

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The initial segment _______

Synapses Flashcards | Quizlet

is; low

normally the site of action potential initiation in the postsynaptic neuron because its threshold is relatively __________.

1. Action potential at synaptic knob Events at a single chemical synapse (5 of them)

2. opening of synaptic knob Ca++ channels 3. NT release into synaptic cleft 4. binding of the NT to receptors 5. opening of chemically gated ion channels

What best describes or is most

membrane potential moves further from threshold

associated with an inhibitory postsynaptic potential>

T/F The summation of all IPSPs

true

and EPSPs occurring at a particular time will occur in a postsynaptic neuron

What happens last of the

opening of chemically gated ion channels

events at the synapse?

Which of these NTs that can

acetylcholine

get broken down by an enzyme? norepinephrine or acetylcholine?

T/F there is increased Na+ and

true

K+ permeability during ESPs

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T/F IPSPs increased K+

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true

permeability

T/F EPSPs are closer to

true

threshold

T/F IPSPs are further from

true

threshold

If two different synaptic knobs

spatial summation

release excitatory transmitters fire at the same time, it will or must cause

What is the normally the site of

the initial segment/axon hillock

action potential initiaion in the postsynaptic neuron?

What are paracrines?

When one neuron synapses

they are local hormones which have an effect on nearby cells and don't go into the blood

divergence

with many other neurons, it's called _________.

What kind of NT is GABA

inhibitory

(gamma-amniobutric acid)?

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What does a somatic motor

it goes to/innervates the skeletal muscles

neuron do?

What affect does cocaine have

decreases the reuptake of dopamine

on the body?

-contains sacs called synaptic vesicles What is the synaptic knob?

-axon terminal of presynaptic neuron ends in a swelling

Acetylcholinesterase _________

prevents

continual stimulation of the membrane

T/F - NT molecules are

true

released into the synaptic cleft by exocytosis

What is an excitatory NT?

What is an inhibitory NT?

T/F Synaptic vesicles contain

NT that opens channels permeable to both K+ and Na+

NT that opens channels permeable to only K+

true

NT molecules

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