psych_0118

psych_0118 - 1/18/08 Friday Psych 10 2nd Week Action...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1/18/08 Friday Psych 10 2 nd Week Action Potential The language of neurons is the action potential Electrochemical impulse that travels at constant strength Either excitatory (yes) or inhibitory (no) Resting potential – the neuron is a rest (no action potential) Axon schematic Outside of axon: more sodium Na+, more positive charge Inside the axon: more potassium (K+), more negative charge (due to chloride and protein) 1. Action potential is causes by an exchange of ions across the neuron membrane 2. Na channels open. Na ions rush into the neuron 3. 4. K channels also open 5. K rushed out of the cells, reversing the depolarization 6. At about this time, Na channels start to close 7. Gradually, the ion concentrations go back to resting levels (resting potential) Chronology of the Action Potential 1. Na+ gates open 2. Inside of axon becomes more positively charged 3. If the inside becomes more positively charged, more Na+ gates open 4. Positively charged potential travels down the axon causing Na+ gates to open allowing
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/02/2008 for the course PSYCH 10 taught by Professor Zaidel during the Winter '08 term at UCLA.

Page1 / 4

psych_0118 - 1/18/08 Friday Psych 10 2nd Week Action...

This preview shows document pages 1 - 2. Sign up to view the full document.

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