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Topic 6
Resting potentials
| Term | Definition |
|---|---|
| What is the cell body of the neurone | This contains the organelles found in a typical animal cell including the nucleus. Proteins and neurotransmitter chemical found here |
| What are dendrites | These carry action potentials to surrounding cells |
| What is the axon | This is the conductive long fibre that carries the nervous impulse along the motor neruone |
| What do Schwann cells do | These wrap around the axon to form the mylelin sheath which is a lipid and therefore doesnt allow charge ions to pass through it. There are gaps between these mylein sheath called nodes of Ranvier |
| What is resting potential | This is the difference between the electrical charge inside and outside of the neurone. |
| For example | There are more posotive ions of Na+ and K+ outside compared to inside therefore the inside of the neruone is comparativley more negative at -70Mmv |
| How is a resting potential maintained | This is through the sodium potassium pump involving active transport and therefore ATP |
| How is a electrochemical gradient formed | This is formed through 2K+ ions in and 3Na+ ions out |
| What does this result in | This results in K+ diffusing out and Na+ diffusing in however becuase the membrane is more permeable to K+ more are moved out resulting in the -70mV |
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yHya