Action Potentials

Question 1

Resting Potential

Answer 1

Voltage gated sodium (Na) and potassium (K) channels are CLOSED

Question 2

Slow Depolarisation

Answer 2

Voltage gated sodium and potassium channels are CLOSED

Question 3

Fast Depolarisation

Answer 3

Sodium channels OPEN and sodium rushes in – depolarises to positive membrane potential

Question 4

Repolarisation

Answer 4

– Sodium channels inactivated
– Potassium channels OPEN
– becomes negative

Question 5

Hyperpolarisation

Answer 5

– Potassium channels remain OPEN