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BS2077 - Neuro & Animal Behaviour > Background Knowledge > Flashcards

Flashcards in Background Knowledge Deck (6)
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0
Q

What is equilibrium potential?

A

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

1
Q

What is membrane potential?

A

Voltage difference across a membrane

2
Q

What is reversal potential?

A
  • 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
Q

How do electrical signals transmit information?

A

By travelling along the dendrites and axons of neurones

4
Q

Describe the two forms of electrical signals

A
  • 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
Q

What follows an action potential?

A

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