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How does an impulse travel from a presynaptic neuron to a postsynaptic neuron?
Wiki User
∙ 13y ago
When the action potential reaches the button(axon terminal) of the presynaptic neuron the depolarization causes voltage gated calcium channels to open increasing intracellular calcium content. This causes synaptic vesicles to fuse to the membrane and release neurotransmitters that bind to the post synaptic neuron and create a chemical action potential.
Wiki User
∙ 13y ago
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How do nerve impulses travel along neurons?
Point to point or saltatory conduction.
What are the two elements needed for neural communication to happen?
Neural communication requires an electrical signal to travel down the axon of a neuron, which is generated by changes in ion concentrations across the cell membrane. At the synapse, neurotransmitters are released from the presynaptic neuron and received by receptors on the postsynaptic neuron to transmit the signal.
What travels through the neuron?
An electrical impulse will travel through a neuron.
In what order does an impulse travel through the structures of the neuron?
What_is_the_process_of_a_nervous_impulse_traveling_through_a_neuron
How long does it take for an impulse to travel from one neuron to another?
one second
Where does the exchange of neurons take place?
Intracellular communication is achieved at the synapse. The presynaptic neuron discharges an action potential which releases a neurochemicals at the presynaptic membrane. This chemical travels across the synaptic cleft until it is taken up by the postsynaptic membrane receptors. Some synapses are electrical, but most are of a chemical nature as described.
What is the function of the dentrites?
Dendrites are attaches to the axon terminals of other neurons. The nerve impulse travel from other neurons into the corresponding neuron via dendrites.
How does a message. travel across the gap. at a synapse?
it is sent through the neurotransmittersAt the synaptic terminal an electrical impulse will trigger the migration of vesicles containing neurotransmitters toward the presynaptic membrane.
What is released when an impulse reaches the end of a neuron?
The impulse ends in the terminal or synaptic knob. Here neurotransmitters are put in vesicles and travel across the synaptic cleft to the next neuron.
Why conduction at synapses is always one-way?
There are two basic reasons. One is that chemical transmission only affects the side in the synapse that have specific receptors for the neurotransmitter released, secondly the presynaptic terminal has been depolarized and is in it's refractory period, where it can not again fire. This is also the reason why the travelling wave of the action potential only travels from the axon hillock where the AP is generated towards the nerve terminal. There is, however, one caveat to this 'rule'. In the CA1 region of the hippocampus there is a retrograde signal from the postsynaptic neuron back to the presynaptic side using the gas NO as the 'transmitter'.
Do blood cells move from the axon terminal to the dendrites?
Technically a neural impulse moves from the cell body to the axon terminal, because a nerve impulse is defined as an electrical signal that travels along an AXON.This may be confusing because neural signals move in three places with respect to the neurons, in three correspondingly different ways, and only one is called the neural impulse.Neural signals move in these places: betweenneurons (ie, from one neuron to another), intoneurons, and along axons (the outputs of neurons, when a neuron has fired).BETWEEN NEURONS: A neural signal can be passed from one neuron to another, at a synapse, across the synaptic cleft, by the release of chemicals called neurotransmittersfrom the presynaptic neuron, which diffuse across the synaptic cleft, to fit into receptors on the postsynaptic neuron. This is a chemical transmission of the neural signal, not an impulse.INTO A NEURON: when a signal has passed from one neuron to another by the release, diffusion, and reception of neurotransmitters, it initiates a graded response in the dendrites of the postsynaptic neuron, which travels with decreasing strength down the dendrites and across the soma (cell body), until it reaches the root of the axon, the axon hillock. This graded response is also not an impulse.ALONG THE AXON: if enough graded response signalsreach the axon hillock at about the same time, (it might be helpful to think of them as degraded signals, since they get weaker the further they travel), such that their combined strengths can trigger an all or nothing action potential in the axon, then it can be said that the neuron has fired a neuronal impulse.So, there are neural signals which move betweenneurons and into neurons, and neural impulses which fire and move along axons from the cell body (soma).
Where is the neuron in the body?
Neuron is the nerve cells that carry messages to the brain .The various parts of neuron are dendrite ,axon ,nucleus , cell body and nerve ending . All the information from the environment is detected by the specialised tips of nerve cells .These receptors are usually located in our sense organs such as,nose , tongue and so on. The information acquired at the end of the dendritic tip of a nerve cell sets off a chemical reaction that creates an electrical impulse . This impulse travels from the dendrite to the cell body , and then along the axon ,to its end .At the end of the axon , the electrical impulse sets of the release of some chemicals . These chemicals cross the gap or synapse, and start a similar electrical impulse in a dendrite of the next neuron . This is how nerve impulse travel in a body
