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Its where there are a lot of sodium channels. Once the trigger zone is 'triggered' to threshold (from -70mV to -55mv), then an action potential occurs.
trigger zone in MOTOR neurons are in the axon hillock and in SENSORY neurons, they're in the 1st unmyelinated area (first node of ranvier).
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∙ 12y ago
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∙ 12y agoFiring level
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What functions as a neurotransmitter?
When impulses reach a synapse they trigger the release of chemicals called neurotransmitters. Molecules of the neurotransmitter cross the synapse and stimulate the receiving neuron to fire an impulse of its own as wave like movements of ions. They may also actively inhibit a receiving neuron from firing.
Who carries messages from the sense organs to the central nervous system?
other nerve cells... The brain is made up of nerve cells (also called neurons). There are neurons both in the central nervous system (the brain and spinal cord) and the peripheral nervous system. The communication between neurons occurs with release of neurotransmitters (chemicals that affect the surface of neurons). The release of neurotransmitters occurs when an electrical impulse travels down the neuron and causes the neuron to "fire" off neurotransmitter. This electrical impulse is called an "action potential." The release of neurotransmitter can have one of two possible effects on the "receiving" neuron, depending on which neurotransmitter binds with which neuron. It can make the receiving neuron either more likely to fire (excitatory) or less likely to fire (inhibitory). The result of this activity in billions of neurons creates quite a symphony, including everything we call thought.
What is the difference between the way excitatory and inhibitory transmitters work?
As a rule more than one presynaptic action potential is needed to fire the postsynaptic neuron or muscle so that the trigger to initiate an action potential are either many subthreshold local potentials from different sources or from the same neuron received within a short period of time. The first case is called spatial summation and the second case is called temporal summation. Whether a postsynaptic potential (another term for a local potential) is excitatory or inhibitory depends on what ion channels are affected by the transmitter released from the presynaptic vesicles.
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).
Period during which potassium ions diffuse out of the neuron due to a change in membrane permeability?
Membrane potential - a nerve cell set and ready to fire;"The wave of reverse polarity" i.e. sodium versus potassium trans-cell-membrane ion passaging - a nerve cell firing; andRecharge period - the regeneration time.
What triggers at a point in which a neuron will fire?
Threshold
How do you shoot clays?
aim and fire Another answer: You do not aim a shotgun, you point a shotgun. You shoot where the target will be when the shot gets there, not where the target is when you pull the trigger. That is called "windage."
Which is the last part of the neuron to be involved in the transmission of a neural impulse towards the next neuron?
Signalling ALONG a neuron is electrical, but signalling BETWEEN neurons is a chemical process. Neuron A 'passes' a message onto the next by releasing chemicals called neurotransmitters , which are then taken up by neuron B. The point at which these neurotransmitters are released from the neuron A is called the 'terminal bouton' and is the end of its axon. More specifically, it is the presynaptic membrane OF the terminal bouton at which the passing on of a message occurs.
What is the purpose of the second trigger on a black powder rifle?
It is called a set trigger. Pull the rear trigger all the way back until you hear a click,the front trigger is now set to fire the weapon with very little pressure.Do not set the trigger in this position unless you are ready to fire down range. It is extreamly dangerous if you are not carefull.
What is it called when you pull back a handgun?
not pulling the trigger, holding fire any other names??
Why should special care be given when using a double set trigger for hunting?
one trigger sets the gun to go off and the other fires it you must squeeze the first trigger then the second to fire the gun and if your not careful and pull the set trigger again instead of the second trigger the gun will not fire plus the second trigger being the fire trigger is usually a hair trigger meaning you barely have to pull it to make the gun fire
What cause neuron to fire?
The neuron adds up all the excitatory and inhibitory inputs and fires when they reach its threshold of excitation.
Can a neuron fire half of its neurotransmitters?
no it's an "all or nothing"
A neuron starts to fire an impulse by the influx of what ions?
sodium
What is a firearm safety?
Most firearms have mechanical device built into the firing mechanism that inhibits the firearm from firing. This is called a "safety."The M16 series, for example, have a selector switch in which the shooter can select from:1- SAFE--gun will not fire if trigger is pulled2- SEMI--gun will fire one bullet when trigger is pulled3- AUTO--gun will fire several bullets when trigger is pulled, until out of ammo, or trigger is released4- THREE ROUND BURST--gun will fire 3 bullets with each pull of the trigger**The 3 round burst function uses a geared cog, and may fire only 1, or 2, or 3 bullets per squeeze of the trigger, depending on which cog tooth was engaged when burst was selected.
Is the neuron ready to fire during the refractory period?
Refractory period
How does a Nerf gun fire?
You pull the trigger
