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BS2077 - Neuro & Animal Behaviour > Background Knowledge > Flashcards

Flashcards in Background Knowledge Deck (6)
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What is membrane potential?

Voltage difference across a membrane

1

What is equilibrium potential?

In a single ion system, the voltage at which there is no net flow of that species of ion across the membrane

2

What is reversal potential?

- Nernst potential
- The voltage at which there is no net flow of ions (of all species) across the membrane (if there is just one ion it's same as equil. potential)
- Can be calculated using Nernst equation
- If one ion Chanel type dominates (high permeability) membrane potential tends towards reversal potential for that ion

3

How do electrical signals transmit information?

By travelling along the dendrites and axons of neurones

4

Describe the two forms of electrical signals

- Action potentials, brief depolarisations generated by voltage-gated Na and K channels. They propagate actively through the neurone and do not decrement in size
- Graded responses, passively propagating, decrementing changes in membrane potential

5

What follows an action potential?

Refractory period - membrane is inexcitable because Na+ channels are closed & inactivated and K+ channels are open. Limits maximum firing rates