Cell Signalling 2

Question 1

What is meant by hyperpolarisation?

Answer 1

This refers to an increase in the charge difference across the membrane so the membrane potential becomes more negative.

Question 2

What is meant by depolarisation?

Answer 2

This refers to a reduction in the charge difference and a less negative membrane potential.

Question 3

What is the membrane potential?

Answer 3

The membrane potential describes the charge of the inside of the cell relative to the outside.

Question 4

What is the threshold value that must be reached before an action potential is fired?

Answer 4

• 55mV