Describe the chemical changes a neuron goes through when a nerve impulse is generated

Explanation:

A nerve impulse is a result of a difference in electrical charges across the plasma membrane of a neuron, this difference comes from ions which are electrically charged atoms or molecules.

Before the nerve impulse happens there's a resting potential in the neuron ready to transmit the impulse, this resting potential happens thanks to the sodium-potassium pump that uses ATP to pump Na+ out of the cell and K+ into it, resulting in the inside of a neuron negatively charged.

When a nerve impulse happens (thanks to the receiving of a chemical signal from another cell) a sudden reversal of the electrical charge of a resting neuron occurs, the inside of the neuron becomes positive when the gates in sodium channels open allowing positive sodium ions to flow back into the cell.

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.