Consciousness

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Action Potentials 101

We say neurons send electrical messages to each other. Really, they send electrochemical signals. What this means is that chemicals in the body of the cell cause an electrical signal. When electrically charged, chemicals are known as ions. In this context, when thinking about neurons, important ions in the nervous system are sodium, potassium (positively charged), calcium (positively charged) and chloride (negatively charged).

When a neuron is at rest, it is not sending a signal. (more…)

Neurons 101

Neurons are brain and nerve cells that transmit electrical activity around the brain and to and from your body, sending messages and allowing you to think. There are several types:

  • Sensory neurons: these carry signals from the outer parts of your body (periphery) into the central nervous system (brain and spinal cord); these help you sense the world around you.
  • Motor neurons: also known as motoneurons, these also carry (more…)