Question

how does a nerve impulse begin once a signal is received? the cell fills with glucose, which gives it an energy surge. water enters the cell and then moves down the cell by osmosis. oxygen diffuses into the cell, which then reacts with ions in the cell. a positive charge is created in the cell, which then travels down the rest of the cell.

Explanation:

When a nerve cell receives a signal, ion - channels open, allowing positively - charged sodium ions to rush into the cell. This creates a positive charge inside the cell relative to the outside, called depolarization, which initiates the nerve impulse. This positive charge then travels down the cell.

Answer:

A positive charge is created in the cell, which then travels down the rest of the cell.