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Transcript

Electric current is the flow of electric charges, or the rate at which charges pass a given point.

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Impulse Compared to Current

  • It is already mentioned how impulse works, but how is it compared to current?
  • Actually, an impulse is just an electrical current that travels through axons.
  • In current, in the electrical field surrounding it has loose electrons which transfer the charges. In impulse, an electric signal is sent through the axon and the potassium and sodium ions are rearranged.

How does it work?

  • Basically, a nervous system is made up of nerves, and nerves are made up of nerve cells. Nerve cells that send messages are called neurons.
  • Neurons receive an impulse, and passes it to the next neuron.
  • When a neuron is at rest, the outside of a neuron has sodium ions, and the inside has potassium ions.
  • When a stimulus reaches a cell, the channels on the outside open and let the sodium ions in.
  • As it is filled with sodium ions, the channels open again, but this time letting the potassium ions out.
  • Then, the neuron returns everything back to normal, but while this is happening, it doesn't respond to any stimuli.

Recap:

  • Current is how fast charges pass a given point, nerve impulse is an electric signal that travels across an axon.
  • When neurons receive an impulse, they send it to the next neuron.
  • A nerve impulse is an electric current that travels through an axon.
  • Currents have free electrons to pass charges, and impulses are transmitted by the rearrangement of ions.

Resources:

http://www.dummies.com/education/science/understanding-the-transmission-of-nerve-impulses/

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elecur.html

http://www.cerebromente.org.br/n12/fundamentos/neurotransmissores/neurotransmitters2.html

Electric Current

Objectives:

  • Define current and nerve impulse.
  • Explain how nerve impulse transmits in the brain.
  • Compare the nerve impulse to current.

Nerve Impulse In The Brain Compared To Current

Nerve Impulse

A nerve impulse is an electric signal that travels across an axon. It's how nerves 'talk' with each other.

An axon is the thread-like part of a nerve cell.

By : Beatrice Erese 8F

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