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How can neurotransmitters have a big-scheme effect when their influence is in fact only between two neurons?
I'm also self-studying Neuroscience, and my understanding of the topic you're asking about is the following:
You're correct to assume that it's more about neuronal pathways than specific ...
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When a neuron fires an action potential, does it contribute the same amount of voltage to each connected neuron?
Neurons connected by chemical synapses do not "contribute voltage" to other neurons.
They release neurotransmitters, neurotransmitter diffuses within the synaptic cleft and binds to ...
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