Questions tagged [neuron]
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Would it be effective to use electrodes on a Caenorhabditis elegans neuron to measure inputs and output pulse strength?
I'd like to build a model of the current responsiveness of a particular neuron.
When we model neurons in a computer, we describe them in terms of their connections and the weight on each neuron, for ...
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22 views
How would blocking Na/K ATPase affect the ability of a neuron to exhibit a series of action potentials?
Neural firing usually occurs in the form of spike series. Several action potentials are happening in a quick succession. Whereas Na/K pumps (and other pumps) restore ion gradients to allow processes ...
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Typical firing patterns of neurons in the default mode network in resting state
Inspired by the Wikipedia article on the default mode network where I read:
Hans Berger, the inventor of the electroencephalogram, was the first
to propose the idea that the brain is constantly ...
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1answer
29 views
Where do the Ca ions that causes neurotransmitter release from synaptic bouton, come from?
I hope the information you share will help clarify the following doubts and gaps in my knowledge:
Where do the Calcium ions in the influx (which then triggers the neurotransmitter vesicles) come from?...
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79 views
Functional unit
What is meant by functional unit of a system?
like when we say that the neuron is the basic unit of neural system do we mean that all those things that are performed by neural system can be performed ...
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27 views
Why didn't the human Cerebrum evolve to have granule cells like the Cerebellum does?
The Cerebellum is much smaller compared to the Cerebrum yet it contains more than half of the total neurons contained in the brain.
That's mainly due to the granule cells in the Cerebellum which ...
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26 views
Effect of myelination on inteligence in cephalopods
Cephalopods are known for their unique intelligence compared to other invertebrates.
The number of neurons of cephalopods is of the order $5*10^8$, similar to dogs. Humans have about $10^{11}$ ...
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53 views
Myelination and time constant
In textbooks, it says that myelination doesn't really affect the time constant as tau=RC where R is the membrane resistance and C is the membrane capacitance. Myelin increases membrane resistance ...
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What are the advantages of bidirectional signalling in electrical synapses?
Electrical synapses are known for being very fast at communicating with other neurons. (1)
What I often see in articles about electrical synapses is that they are bidirectional.(1) This is seen as a ...
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94 views
What is the difference between axon and dendron?
I have seen the following answers on the internet.
1. Dendron transmits signal towards cell body and axon transmits signal away from it
2. Axon is often myelinated and longer
3. Axon terminal end has ...
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1answer
72 views
What causes sodium channels to open?
What triggers the opening of sodium channels in a neuronal membrane? Is it acetylcholine that activates sodium channels in the postsynaptic membrane?
Are sodium channels like receptors that have to ...
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1answer
92 views
Understanding presynaptic and postsynaptic inhibition
One way to classify neural inhibition is based on the inhibition being "presynaptic" or "postsynaptic".
As far as I understand, the two different types of inhibition refer to the following:
...
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1answer
52 views
Relationship between membrane current and voltage in neurons
Depolarization of neurons leads currents of different magnitudes flow in or out of the cell, and the Sodium and Potassium currents can be separately plotted (Purves):
Caption: Relationship between ...
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40 views
How long does it take the neurotransmitters to diffuse accross the synaptic cleft?
Neurotransmitters get from the pre-synaptic neuron to the receptors on the post-synaptic neuron by diffusion across the gap between these two (the synaptic cleft). My question is, how much time does ...
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8 views
How much is the motion speed of calcium ions in ion channels and neurons?
As far as I know, calcium ions moving in a Brownian manner are responsible for the performance of neurons and neuro-transmitters. My question is, how much kinetic energy these calcium ions have and ...
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1answer
50 views
When do the first neurons appear in humans?
According to this
Neural Plate
The neural plate appears in day 18 in humans (very specific).
and according to this
Neural Plate (wiki)
The progenitor cells that make up the precursors to neural ...
