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How is a receptor potential similar to an excitatory post synaptic potential generated at a synapse?
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What determines if an action potential is initiated in the postsynaptic neuron?
Every time neurotransmitter is released from the presynaptic neuron it generates an excitatory post synaptic potential(EPSP) in the postsynaptic neuron. When the EPSP is greater than the threshold for excitation an action potential is generated.
How does synaptic integration determine if a nerve impulse is generated or not generated in a neuron?
Neurons integrate incoming signals and sum up the excitatory and inhibitory signals, integration. The excitatory neurotransmitter produces a potential change (signal). This signal pushes the neuron closer to an action potential. If the neuron receives excitatory signals chances are that the axon will transmit a nerve impulse. The inhibitory neurotransmitter produces signals that drive neurons further from an action potential. If neurons receive both the inhibitory and the excitatory signals the summing of the signals may prohibit the axon from firing.
What ion is the cause of excitatory post-synaptic potential?
I think it is the na+ ions because they bring the AP closer to threshold
When neurotransmitters bind to or attach to receptor sites the probability of the postsynaptic neuron firing an action potential?
... Depends entirely on the post-synaptic neuron. If it is an inhibitory synapse (often located on the actual body of the dendrite or soma), then the probability of that post-synaptic neuron firing DECREASES. The reverse is true if it is excitatory; the synapse (more likely located on a dendritic spine) will more likely induce the post-synaptic neuron to fire an action potential.
What is synaptic potential?
synaptic potential
The space between one neuron and the next is a?
This area is referred to as the synaptic cleft. This area is bound by the end of one neuron (the terminal bouton) and the post-synaptic membrane of the next neuron. When an action potential reaches the terminal bouton, Ca2+ influx triggers the release of neurotransmitters across the cleft, which bind to receptors on the post-synaptic membrane, allowing for an post-synaptic excitatory potential (PSEP) to be formed in the next neuron.
What is the difference between action potentials and synaptic potentials?
A synaptic potential exists at the INPUT of a neuron (dendrite), and an action potential occurs at the OUTPUT of a neuron (axon). (from OldGuy)(from Ilantoren:) A synaptic potential is the result of many excitatory post synaptic potentials (epsp) each one caused by the synaptic vesicles released by the pre-synaptic terminus. If there are enough of these epsp then the responses will summate and depolarize the post-synaptic membrane at the axon hillock enough to fire an action potential.
Is end plate current the same as end plate potential?
No, end plate current of excitatory post-synaptic current(EPSC) represents the sum of the currents through thousands of AChRs in the postsynaptic membrane. The end-plate potential or Excitatory post-synaptic potential(EPSP) is the local depolarisation at the post-synaptic membrane which eventually results in an action potential at the postsynaptic membrane of the neuromuscular junction. EPSP is much slower than the EPSC because of the time necessary to charge and discharge the capacitance of the muscle membrane. Hope this helps, there is a lot more detail in the notes we were given which I'll be happy to share if you need it.
WhatConversion of a stimulus into a generator potential is?
Receptor potential, a type of graded potential, is the transmembrane potential difference of a sensory receptor. A receptor potential is often produced by sensory transduction. It is generally a depolarizing event resulting from inward current flow. The influx of current will often bring the membrane potential of the sensory receptor towards the threshold for triggering an action potential. A receptor potential is a form of graded potential, as is a generator potential. It arises when the receptors of a stimulus are separate cells. An example of this is in a taste bud, where taste is converted into an electrical signal sent to the brain. When stimulated the taste bud triggers the release of neurotransmitter through exocytosis of synaptic vesicles from the presynaptic membrane. The neurotransmitter molecules diffuse across the synaptic cleft to the postsynaptic membrane. A postsynaptic potential is then produced in the first order neuron, and if the stimulus is strong enough to reach threshold this may generate an action potential which may propagate along the axon into the central nervous system
What synaptic inputs might influence the activity of spinal motorneurons?
The excitatory or inhibitory inputs from cerebrum.
How can decision-making in the CNS result from the interaction between the activities of excitatory and inhibitory presynaptic neurons at synapses?
During decision-making, information is processed to choose between two or more alternatives. This involves the interaction of excitatory and inhibitory neurons. This process also involves excitatory and inhibitory neurotransmitters. The post-synaptic action potential is determined by the sum of all signals.
What forms receptor sites on the post synaptic cell membrane?
your DNA.
