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Title: How does a nerve impulse trasmit from one neuron to another? Post by: o2982794@rtrt on May 8, 2013 I don't get it- In my anatomy text book it just talks about how an unmyelinatd axon conducts impulses over it's entire surface and the difference between unmyelinatd and myelinated axons and the explanation doesn't really answer my question? can anyone help me out?
Title: How does a nerve impulse trasmit from one neuron to another? Post by: juan56891 on May 8, 2013 both types transmit action potentials along their lengths ... myelinated fibers have nodes of Ranvier and myelin sheaths that insulate the axon and promote faster impulses...text books sometimes indicate that the potential jumps from node to node which isn't really true...it appears to "jump" only because the sheath prevents measuring it except at the nodes..
Title: How does a nerve impulse trasmit from one neuron to another? Post by: nuria on May 8, 2013 Signalling from one neuron to another is performed by neurotransmitters.
When the action potential reaches the end of the axon (the axon terminus) it causes the release of chemicals called neurotransmitters into the gap between the first neuron and the next (the synapse). These neurotransmitters are detected by receptors on the post-synaptic neuron, and they signal it to start an action potential. This mechanism is found in both myelinated and unmyelinated neurons. |