0
sodium
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
A neuron fires only when its membrane reaches what?
When it reaches the nerve impulse threshold, the next neuron will fire..
Why causes the neurons fire?
Neurons are nerve cells, and they fire to relay messages from neuron to neuron. Neurons fire when a charge jumps across a synapse to the dendrite of a cell. The neuron then fires the charge down it's axon, and the charge travels to the next neuron.
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.
Does the neuron respond to all impulses?
Yes a neuron will always respond to the binding of neurotransmitters released from another cell (synaptic transmission being the 'impulse'). Depending on which neurotransmitter was bound, the postsynaptic potential of the membrane will become either more positive or more negative. It is the summation of these inputs and membrane potentials that determine whether the cell will subsequently fire an action potential.
Is the neuron ready to fire during the refractory period?
Refractory period
A neuron fires only when its membrane reaches what?
When it reaches the nerve impulse threshold, the next neuron will fire..
Why causes the neurons fire?
Neurons are nerve cells, and they fire to relay messages from neuron to neuron. Neurons fire when a charge jumps across a synapse to the dendrite of a cell. The neuron then fires the charge down it's axon, and the charge travels to the next neuron.
What is the main part of the of a neuron?
It depends on what you mean by 'main'. The AXON is the part which CONVEYS the neural impulse, which could be thought of as the main FUNCTION of the neuron. But the DENDRITES are the parts which assess whether the neuron has been stimulated enough to fire the axon, which is another fundamental function of some neurons. And the BODY (soma) of the neuron is very much a 'main' part of the neuron, because without it the neuron would die.
Neurotransmitters categorized as inhibitory are expected to?
Inhibitory neurotransmitters prevent the firing of neurons by binding with certain receptors, causing the influx of chloride ions to hyperpolarize the neuron. When this happens, it requires a much larger excitatory signal to override the inhibitory effects in order to allow the neuron to fire.
what cell carries messages from nerve cells to your brain?
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.
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.
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 triggers at a point in which a neuron will fire?
Threshold
Does the neuron respond to all impulses?
Yes a neuron will always respond to the binding of neurotransmitters released from another cell (synaptic transmission being the 'impulse'). Depending on which neurotransmitter was bound, the postsynaptic potential of the membrane will become either more positive or more negative. It is the summation of these inputs and membrane potentials that determine whether the cell will subsequently fire an action potential.
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"
Is the neuron ready to fire during the refractory period?
Refractory period
