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Flashcards in The Resting Potential Deck (13):
0

What is the value for resting potential?

-70 mv

1

What drives an ion from high to low concentration?

A concentration gradient

2

What does an electrical gradient do?

Drives an ion towards an area of opposite charge

3

Are ion pumps or ion channels active?

Ion pumps (they move ions against their concentration gradient)

4

What is the membrane permeable to?

Freely permeable to potassium and only slightly permeable to sodium

5

What four factors contribute to the resting potential?

Hate intracellular protiens, the sodium/potassium pump, potassium ions and sodium ions

6

Hat do large negatively charged intracellular proteins do?

Stay in the cell and contribute to the negativity

7

What does the sodium/potassium pump do?

Moves 3NA ions out for every 2K ions in. It contributes to the cells negativity

8

What is an equilibrium potential (Eion)?

The electrical potential difference that exactly balances an ionic concentration gradient

9

What is the Nernst equation?

The voltage produced by a difference in concentration of a single ion across a membrane

10

Why is the Nernst equation not sufficient in calculate resting membrane potential?

Because it does not take the sodium ions into consideration

11

What equitation can be used to calculate the resting potential (Vm)?

The Goldman-Hodgkin-Katz equation

12

What is Vm-Eion?

The ionic driving force