NUR968: Membrane Potentials & Action Potentials; Cell Signaling & Second Messenger Systems Practice Questions and Answers
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Module
NUR 2024/2025
Institution
NUR 2024/2025
NUR968: Membrane Potentials & Action
Potentials; Cell Signaling & Second
Messenger Systems Practice Questions
and Answers
What is the membrane potential? - Ans:-Defined as the electrical potential difference across a cell's
plasma
How are ions classified? (2) - Ans:-1. Cations (positively cha...
-As potassium leaves, it takes with it a positive charge leaving the inside of the cell "more negative". This
negativity then pulls potassium back in
Recall from Module 1:
When the Sodium Potassium Pump runs, 3 Na+ move OUT; 2 K+ move IN. What is happening
inside/outside of the cell each time this happens? - Ans:✔✔-The inside of the cell becomes more
NEGATIVE & the outside becomes more POSITIVE (Separation of Charges)
What is a key player in maintaining the concentration gradients?*** - Ans:✔✔-Sodium Potassium Pump
-Overall, sodium is predominately on the outside of the cell
-Potassium is predominately kept on the inside
Nernst Equation
-Nobel prize in 1920
-Relates the __ __ to the electrical force
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