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What is a synapse? How do impulses travel over it?

Answer 1

Madeline Andrews

It is an electrical impulse travels along an axon.

It is an electrical impulse travels along an axon. It triggers the nerve-ending of a neuron to release chemical messengers called neurotransmitters.
These chemicals diffuse across the synapse and bind with receptor molecules on the membrane of the next neuron.

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Answer 2

Madeline Andrews

A synapse is the junction of two nerve cells where signals are passed between them via a process known as neurotransmission. When an electrical signal, or action potential, reaches the end of a nerve cell (presynaptic neuron), it releases neurotransmitter molecules into the synapse, where they diffuse and bind to receptors on the membrane of the following nerve cell (postsynaptic neuron), changing its electrical state and starting a new action potential.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.