Steps in an Action Potential

Steps in an Action Potential - Steps in an Action Potential...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Steps in an Action Potential 1. At rest the outside of the membrane is more positive than the inside. 2. Sodium moves inside the cell causing an action potential, the influx of positive sodium ions makes the inside of the membrane more positive than the outside. 3. Potassium ions flow out of the cell, restoring the resting potential net charges. 4. Sodium ions are pumped out of the cell and potassium ions are pumped into the cell, restoring the original distribution of ions. Synapses The junction between a nerve cell and another cell is called a synapse . Messages travel within the neuron as an electrical action potential. The space between two cells is known as the synaptic cleft . To cross the synaptic cleft requires the actions ofneurotransmitters . Neurotransmitters are stored in small synaptic vessicles clustered at the tip of the axon.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Arrival of the action potential causes some of the vesicles to move to the end of the axon and discharge their contents into the synaptic cleft. Released neurotransmitters
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

Page1 / 3

Steps in an Action Potential - Steps in an Action Potential...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online