The Nerve Impulse

Question 1

Stimulations of a neurone causes the _______ _________ to change a little

Answer 1

Resting Potential

Question 2

If the change results in a membrane potential above -55mV, the voltage-gated ______ ion channels open

Answer 2

Sodium

Question 3

Sodium ions rush in, down their ____________ gradient

Answer 3

Concentration

Question 4

This makes the inside of the cell more ________, his is called ______________

Answer 4

Positive
Depolarisation

Question 5

When the potential difference reaches _____, the voltage-gated sodium channels close and the voltage-gated _________ channels open

Answer 5

+40mV
Potassium

Question 6

Potassium ions diffuse out of the axon and down their _____________ gradient

Answer 6

Concentration

Question 7

The inside of the cell become more ________ again, this is called ______________

Answer 7

Negative
Repolarisation

Question 8

So many potassium ions leave, the potential __________ slightly. This is called _________________

Answer 8

Overshoots
Hyperpolarisation

Question 9

There is then a short period when the sodium-potassium pump re-established the ________ _________

Answer 9

Membrane Potential