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what most directly causes synaptic vesicles to release acetylcholine into the synaptic cleft

by Sven Smith Published 3 years ago Updated 2 years ago

What most directly causes synaptic vesicles to release acetylcholine into the synaptic cleft? rationale: Calcium entry causes synaptic vesicles to release acetylcholine into the synaptic cleft.

Full Answer

Where do synaptic vesicles fuse and release acetylcholine?

Synaptic vesicles fuse to the plasma membrane of the axon terminal and release acetylcholine. Acetylcholine binds to its receptor in the sarcolemma and triggers __________. the opening of ligand-gated cation channels Sodium and potassium ions do not diffuse in equal numbers through ligand-gated cation channels. Why?

What is the difference between acetylcholine receptors and synaptic vesicles?

Acetylcholine receptor: a type of chemically-gated ion channel located on the junctional folds of the muscle fiber. Synaptic vesicle : membranous sac located in the axon terminal that contains neurotransmitter.

What would happen if acetylcholine was not removed from the synaptic cleft?

broken down by acetylcholinesterase What would happen if acetylcholine was not removed from the synaptic cleft? Multiple action potentials would occur in the muscle fiber.

What is the function of acetylcholine at synapses?

Acetylcholine has different roles and functions at different synapses throughout the body. In the somatic nervous system, acetylcholine is used at the neuromuscular junctions, triggering the firing of motor neurons and affecting voluntary movements.

What process releases acetylcholine into the synaptic cleft?

The release of acetylcholine occurs when an action potential is relayed and reaches the axon terminus in which depolarization causes voltage-gated calcium channels to open and conduct an influx of calcium, which will allow the vesicles containing acetylcholine for release into the synaptic cleft.

What causes the release of acetylcholine from the synaptic vesicles quizlet?

An action potential in the motor neuron causes ACh to be released into the synaptic cleft. Binding of ACh to sarcolemma receptors initiates graded potentials.

What most directly causes the exocytosis of ACh in synaptic vesicles?

What most directly causes the exocytosis of Ach in synaptic vesicles? synaptic cleft. When calcium ions enter the synaptic terminal, they cause vesicles containing neurotransmitter molecules to fuse to the plasma membrane of the sending neuron.

What directly triggers the release of acetylcholine from a terminal bulb?

Acetylcholine is released into the cleft by active transporters in the plasma membrane of the axon terminal. Cation channels open and sodium ions enter the axon terminal while potassium ions exit the axon terminal. Synaptic vesicles fuse to the plasma membrane of the axon terminal and release acetylcholine.

What stimulates ACh release into the synaptic cleft of a neuromuscular junction quizlet?

What stimulates ACh release into the synaptic cleft of a neuromuscular junction? An action potential opens voltage-gated Ca2+ channels in the axon terminal.

What event causes the release of neurotransmitters into the synaptic cleft?

the action potentialThe arrival of the nerve impulse at the presynaptic terminal stimulates the release of neurotransmitter into the synaptic gap. The binding of the neurotransmitter to receptors on the postsynaptic membrane stimulates the regeneration of the action potential in the postsynaptic neuron.

Which of the following toxin induces release of acetylcholine?

Abstract. Clostridium botulinum type toxin A (BoTx) blocks stimulus-induced acetylcholine (ACh) release from presynaptic nerve terminals at peripheral neuromuscular junctions.

What enzyme breaks down acetylcholine within the synaptic cleft is?

Acetylcholinesterase is the enzyme responsible for breakdown of acetylcholine in the synapse.

What means of membrane transport is used to release the neurotransmitter into the synaptic cleft?

What means of membrane transport is used to release the neurotransmitter into the synaptic cleft? exocytosis. (Yes, the synaptic vesicles (where the neurotransmitter is stored) merge with the membrane and release the neurotransmitter by exocytosis.)

What triggers synaptic transmission?

Synaptic transmission is initiated when an action potential invades a nerve terminal, opening Ca2+ channels, which gate a highly localized, transient increase in intracellular Ca2+ at the active zone (Fig.

What triggers for synaptic transmission to happen?

Synaptic transmission involves communication between two or more cells. However, synaptic communication is triggered by electrical activity within neurons and involves the movement of electrical charges carried by ions.

What event directly triggers the release of neurotransmitter shown in A?

What event directly triggers the release of neurotransmitter shown in A? A nerve impulse arrives at the axon terminal triggering the opening of Ca2+ channels, which allows for the diffusion of Ca2+ into the terminal. This in turn leads directly to the release of neurotransmitters by exocytosis.

What triggers exocytosis of synaptic vesicles quizlet?

The influx of calcium ions into the " " triggers exocytosis of synaptic vesicles.

What triggers the release of a neurotransmitter from the presynaptic neuron vesicles quizlet?

When an action potential reaches the synaptic terminal, voltage-gated channels open and calcium enters the cell. Calcium causes vesicles to fuse with the presynaptic membrane and release neurotransmitter into the synaptic cleft.

What do synaptic vesicles do quizlet?

Synaptic vesicles in the presynaptic membrane store neurotransmitters that are used to communicate across the synaptic cleft.

What does a synaptic vesicle do?

Synaptic vesicles play the central role in synaptic transmission. They are regarded as key organelles involved in synaptic functions such as uptake, storage and stimulus-dependent release of neurotransmitter.

Where do multiple action potentials occur?

Multiple action potentials would occur in the muscle fiber. The site where a motor neuron excites a skeletal muscle fiber is called the neuromuscular junction. This activity will test your understanding of the sequence of events that occur at the neuromuscular junction.

What is the term for the propagation of action potentials along the sarcolemma?

Excitation , in this case, refers to the propagation of action potentials along the sarcolemma. Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber.

Where are calcium ions stored in the skeletal muscle fiber?

Where are calcium ions stored within the fiber? Calcium ions are stored in the sarcoplasmic reticulum. After a power stroke, the myosin head must detach from actin before another power stroke can occur.

What happens to myosin after it detaches?

After the myosin head detaches, energy from ATP hydrolysis is used to re-cock the myosin head. BMD (2,3-butanedione 2-monoximime) inhibits myosin, such that ATP can bind to myosin but myosin is unable to hydrolyze the bound ATP.

How does acetylcholine bind to receptors?

Step 3: Synaptic vesicles fuse to membrane of axon terminal. Step 4: Acetylcholine is released into the synaptic cleft. Step 5: Acetylcholine binds to its receptors on the junctional folds.

Which vesicle contains neurotransmitter?

Synaptic vesicle : membranous sac located in the axon terminal that contains neurotransmitter. Calcium channel : a type of voltage-gated ion channel located on the axon terminal. Sodium channel : a type of voltage-gated ion channel located on the sarcolemma of the muscle fiber. Acetylcholine : neurotransmitter that stimulates skeletal muscle ...

What enzyme breaks down acetic acid and choline?

Select all the correct answers. -ACh diffuses away from the synaptic cleft. -ACh is broken down into acetic acid and choline by the enzyme acetylcholinesterase (AChE). Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft.

How does K+ diffuse out of muscle fiber?

K+ diffuses out of the muscle fiber through open chemically gated ion channels. 2. The end plate potential is primarily, and most directly, caused by the movement of Na+. 3. ACh binds to ACh receptors, causing them to open chemically gated ion channels.

Where is acetylcholinesterase located?

Acetylcholinesterase : enzyme located in the synaptic cleft that breaks down acetylcholine. Synaptic cleft : the space between the axon terminal and junctional folds. Arrange the sequence of events at the NMJ from first to last. Rank the sequence of events at the NMJ that initiate an action potential in the muscle fiber, from first to last.

Where do multiple action potentials occur?

Multiple action potentials would occur in the muscle fiber. The site where a motor neuron excites a skeletal muscle fiber is called the neuromuscular junction. This activity will test your understanding of the sequence of events that occur at the neuromuscular junction.

Does EGTA bind calcium ions?

Do not overlap any events. EGTA is a substance that binds calcium ions. Imagine an experimental setup with a motor neuron and a muscle fiber. Stimulation of the motor neuron causes contraction of the muscle fiber through activity at the neuromuscular junction and excitation-contraction coupling.

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