In which direction does the electrical impulse travel in a nerve cell of an animal after being created?
Show answer & explanation
Correct answer: A
Explanation
From the depolarization to the cell body, then through the axon
Transmission of an impulse in a neuron
Within a nerve cell, the electrical impulse always travels in a specific direction. The process is as follows:
Reception: Information is first received by specialized ends of the nerve cell, called depolarizations.
Generation of an electrical impulse: A chemical reaction occurs at the depolarization, generating an electrical impulse.
Cytobody: This impulse travels from the depolarization to the cell body.
Axon: From the cell body, this impulse travels through the axon to its terminal.
Synapse: At the end of the axon, the electrical impulse releases certain chemicals that cross a gap (synapse) to reach the depolarization of the next neuron.
Important parts and their functions:
Dendrite: Collects information.
Cytobody: Processes the received information.
Axon: Carries impulses away from the cell body.
Myelin sheath: A protective layer around the axon that increases the speed of impulses.