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By a chemical released by an axon.
Florine Wiza
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∙ 12y agoMost neurons have a chemical synapse, which is to say that a substance called a neurotransmitter is released from the first neuron (called pre-synaptic) to the next neuron called (post-synaptic). How is the release triggered? When an action potential reaches the terminus (end of the axon) there are specialized calcium channels that are opened (voltage-gated). The calcium bind so the inner membrane and triggers the release of small membrane bound vesicles which spill out their contents of neurotransmitter into the synaptic cleft. The neurotransmitter binds to specific receptors on the post-synaptic membrane and that causes the action potential to propagate on (or for the neurotransmitter to cause an action like a muscle contraction).
Wiki User
∙ 15y agoThe electrical impulse doesn't cross the synaptic cleft. Rather the action potential triggers the entry of calcium into the nerve terminus which then leads to the fusion of the synaptic vesicles with the membrane and the release of neurotransmitter. On the other side the synaptic cleft the neurotransmitter opens ligand dependent voltage channels and triggers an action potential in the next neuron. There are such things as cells where a tight junction allows a direct electrical stimulation of the post-synaptic neuron. This is the situation in heart and in smooth muscle.
Wiki User
∙ 15y agoMost neurons have a chemical synapse, which is to say that a substance called a neurotransmitter is released from the first neuron (called pre-synaptic) to the next neuron called (post-synaptic). How is the release triggered? When an action potential reaches the terminus (end of the axon) there are specialized calcium channels that are opened (voltage-gated). The calcium bind so the inner membrane and triggers the release of small membrane bound vesicles which spill out their contents of neurotransmitter into the synaptic cleft. The neurotransmitter binds to specific receptors on the post-synaptic membrane and that causes the action potentialto propagate on (or for the neurotransmitter to cause an action like a muscle contraction).
Wiki User
∙ 10y agoNerve impulses travel from neuron to neuron via neurotransmitters that are released into the synapse by the sending neuron. The neurotransmitter binds to a receptor on the receiving neuron. When enough receptors are triggered, an action potential is initiated on the receiving neuron.
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∙ 13y agoImpulses travel along the nerve via the myelin sheaths that cover them...between the nerves are chemicals that conduct the impulses from nerve to nerve with the help of dendrites at nerve end.
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∙ 11y agoa nerve impulse moves by a path made by a chemical released by the nerve cell.
Wiki User
∙ 10y agoA neural signal crosses a synapse by a chemical referred to as a neurotransmitter diffusing across the synaptic cleft (gap).
Wiki User
∙ 16y agoby neurotransmitters.
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How do electrical impulses go across synapses?
An electrial nerve impulse travels across a synapse by diffusion. The neurotransmitter substance from the pre-synaptic cleft travels across the synapse via diffusion. This is then received by receptors in the post synaptic cleft
What is an axoplasm?
An axoplasm is the cytoplasm of an axon - a nerve fibre which conducts nerve impulses away form the body of a cell, to a synapse.
3 Why do nerve impulses need to travel faster in a Human than in an earthworm?
1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm?
A synapse is the space between what?
Usually from the axon of one nerve to the dendrite of another. The axon sends impulses away from the nerve body, and the dendrite receives impulses from other nerves.
What is the point at which a nerve impulse is sent from one nerve cell to another?
It diffuses across a small gap called a synapse between the two nerve cells. It is passed as a neurotransmitter (in chemical sacs). They reach the end of one cell and the impulse is converted into neurotransmitters, which are released from that cell, diffuse across the gap, and land on the receptor site, where they are converted back into electrical impulses.
What is the area between neurons across which nerve impulses travel?
no, synapse. node of ranvier is between axon and dendrites
Which of the following helps carry nerve impulses across the synapse?
neurotransmitter carries the nerve impulses from neuron to neuron across a synapse
What is another name for the messages that travel across the nerve cell?
Synapse
What is the space between two adjacent nerve cells?
its known as the synapse. Through the synapse is where impulses travel from brain cell to brain cell.
What is the distance across a nerve synapse?
The distance across a nerve synapse is 20 nanometres or 2x10-8 metres
How do electrical impulses go across synapses?
An electrial nerve impulse travels across a synapse by diffusion. The neurotransmitter substance from the pre-synaptic cleft travels across the synapse via diffusion. This is then received by receptors in the post synaptic cleft
Do Nerve impulses travel quickly?
yes, in woman nerve impulses travel to the brain faster than men
Which nerve fiber do impulses travel slowly?
Impulses travel more slowly through unmyelinated nerve fiber.
What does a vesicle mainly do?
A vesicle is a small small, bubblelike structure at the tip of an axon that releases neurotransmitters to carry nerve impulses across the synapse between two neurons.
How fast nerve impulses travel?
Nerve impulses travel through nerve fibers, and the speed of which they travel depends on the type of nerve fiber. They travel usually around 86 miles per hour.
What is an axoplasm?
An axoplasm is the cytoplasm of an axon - a nerve fibre which conducts nerve impulses away form the body of a cell, to a synapse.
3 Why do nerve impulses need to travel faster in a Human than in an earthworm?
1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm? 1) Why do nerve impulses need to travel faster in a Human than in an earthworm?
