Nerves 2 Flashcards

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1
Q

Function of the resting membrane potential

A
  • Keep the cell ready to fire
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2
Q

What is the value of the RMP?

A

About -70mV

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3
Q

What does equilibrium potential mean?

A

Membrane potential when electrical gradient is exactly equal and opposite to the conc gradient

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4
Q

What is the resting membrane potential dependent on most importantly?

A
  • Leaky potassium channels
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5
Q

What happens to the heart if there is too much potassium in the body

A
  • No heart-blood barrier
  • Conc gradient reduced
  • RMP reduced
  • Cell depolarises
  • Ventricular fib
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6
Q

How do astrocytes cause the blood brain barrier?

A
  • Cause capillaries to be extra tight
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7
Q

What is the equilibrium potential for potassium?

A

About -90mV

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8
Q

Why is normal resting membrane potential -70mV

A
  • Other leaky channels exist such as Na and Cl
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