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Questions tagged [neuron]

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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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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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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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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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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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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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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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49 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 ...