Lecture18

Question 1

What is a voltage gated ionchannel?

Answer 1

Transmembrane protein that play important roles in the electrical signalling of cells. Regulated by the membrane potential of a cell. Open channels allow the movement of ions along an electrochemical gradient across cellular membranes.

Question 2

Is the concentration of sodium high or low outside the cell

Answer 2

High

Question 3

Is the concentration of potassium high or low inside the cell

Answer 3

High

Question 4

At resting membrane potential what is the ability of ions to leave/enter the cell.

Answer 4

Sodium is less able to enter the cell and potassium is much more able to leave.therefore the exit of potassium dominates, leaving behind negativity