Question

What is synapse? how does a nerve impulse cross a synapse?

Answer 1

The signal crosses the gap, called a synapse, between cells in chemical form. One neuron releases chemicals in response to an action potential (nerve impulse). The chemicals travel across the synapse and stimulate an action potential in the next neuron. These chemicals are known as neurotransmitters.

Answer 2

Explanation:

At a synapse, one neuron sends a message to a target neuron—another cell. ... At a chemical synapse, an action potential triggers the presynaptic neuron to release neurotransmitters. These molecules bind to receptors on the postsynaptic cell and make it more or less likely to fire an action potential.