Nerves 2 Flashcards
1
Q
Function of the resting membrane potential
A
- Keep the cell ready to fire
2
Q
What is the value of the RMP?
A
About -70mV
3
Q
What does equilibrium potential mean?
A
Membrane potential when electrical gradient is exactly equal and opposite to the conc gradient
4
Q
What is the resting membrane potential dependent on most importantly?
A
- Leaky potassium channels
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
6
Q
How do astrocytes cause the blood brain barrier?
A
- Cause capillaries to be extra tight
7
Q
What is the equilibrium potential for potassium?
A
About -90mV
8
Q
Why is normal resting membrane potential -70mV
A
- Other leaky channels exist such as Na and Cl
