The study of the structure and function of the nervous system and its components.

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Can a single axon propagate multiple simultaneous action potentials?

I have not been able to locate any research that indicates whether a single axon of a neuron or nerve cell can conduct multiple simultaneous (i.e. spatially separate) action potentials. I am aware ...
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What is meant by drug tolerance?

What is meant by drug tolerance? This question is in my biology textbook for IGCSE and I have no idea what drug tolerance is. It would be very helpful if someone could clarify. Thank you.