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Acetylcholine

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Q: Within the axonal endings are many small vesicles containing a neurotransmitter substance called?
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Substance released at axonal endings to stimulate a nervous impulse is?

a neurotransmitter


Where is neurotransmitter stored?

Neurotransmitters are stored in synaptic vesicles in the terminal bouton of pre-synaptic axons. They are released from the terminal bouton into the synaptic cleft and the neurotransmitters exert their action on the post-synaptic neurons.


Which structure contains vesicles with acetylcholine?

Synaptic vesicles in the neuromuscular junction contain acetylcholine (ACh) which is the neurotransmitter for initiating muscular contractions.


What chemical is released when the nerve impulses reaches the nerve endings?

Acetylcholine is NOT the only chemical transmitter released by nerve endings. There are literally dozens. Ach is only the first discovered. Others include: glutamate, aspartate, serine, gamma-aminobutyric acid, glycine,dopamine, norepinephrine, epinephrine (adrenaline), histamine, serotonin, melatonin, adenosine, anandamide, True ACh was discovered first and is not the only neurotransmitter released, BUT Acetylcholine is basically the one of most important in producing an impulse.


What is the neurotransmitter that is released into the synaptic cleft?

Vesicles containing the neurotransmitters are caused to fuse with the neuron's cell membrane, which thereby presents the neurotransmitters to the outside of the neuron, into the synapse.As I'm sure you know a neurotransmitter is how two neurons communicate at a synapse. It can be one of many molecules, often nor-epinephrine/nor-adrenaline. Neurotransmitters are stored in structures called vesicles in a bulb at the end of the axon the presynaptic neuron. These vesicles are like balloons containing the neurotransmitters, what would be the rubber of the balloon is actually made of the same plasma membrane that surrounds the rest of the cell. When the Action Potential (AP) coming down the axon gets to the bulb it causes Ca ion channels to open. These channels are membrane bound proteins ant act as voltage gated channels in the same way the Sodium ion channels in the axon do. The opening of these channels allows calcium entry into the cells. There are another class of membrane bound proteins that are important here, the Docking proteins. Ca ions activate the docking proteins by binding to them. What these proteins do is effectively grab the vesicles, containing the neurotransmitter, and make the membrane merge with the cells membrane. This is exactly like the opposite of phagocytosis, the cell then secretes the neurotransmitter into the synaptic cleft.The neurotransmitter must then & isreleased from the receptor site, in order to prevent continuing and constant over-stimulation of the post-synaptic neuron. It can be carried back to the presynaptic neuron for either repackaging into vesicles or broken down there by enzymes, or some neuropeptide neurotransmitters simply diffuse away into the surrounding medium, and one (acetylcholine) is broken down right in the synaptic cleft.


Is acetylcholine the substance released by axonal endings of the somatic efferent fibers and by the parasympathetic nerve fiber endings?

Yes, it does. In contrast, the sympathetic nerves release adrenaline


Select the option that lists the steps of normal nerve function in the correct order?

ACh is produced at the intercellular level and is stored in vesicles at nerve endings. nerve endings release ACh ACh attavhes to the receptor site at the receiving nerve ACh is broken down by AChE to prevent accumulation


How does the botulinum toxin act in humans?

Botulinum toxin latches onto specific proteins in nerve endings and irreversibly destroys them. These proteins control the release of acetylcholine, a neurotransmitter that stimulates muscle cells.


Are neurotransmitters stored within motor neuron endings?

False. Nodes of Ranvier are sections along a mylenated axon that are not mylenated. Instead they contain numerous voltage gated Na and K channels. These channels help transmit the chemical depolarization along the axon until it reaches the synaptic node. Neurotransmitters are stored in synaptic vessicles in the synpatic node.


Are endings added to roots prefixes or suffixes?

Endings are added to roots. These endings are called suffixes by the way.


How many wed endings are there?

How many wed endings are there?


When was Alternate Endings created?

Alternate Endings was created in 2004.