Electrochemical Impulse

Question 1

ELECTROCHEMICAL IMPULSES

Sodium potassium pump?

Answer 1

Every three Na out, 2 K in results in negative charge inside cell membrane

Question 2

ELECTROCHEMICAL IMPULSES

action potentials?

Answer 2

1. Neuron membrane maintains resting potential (-70mV)
2. Threshold stimulus is received
3. Sodium channels open
4. Na into cell, depolarizing membrane (+40mV)
5. sodium channels close, potassium channels open
6. K into cell, repolarizing membrane
7. Membrane becomes hyper polarized to -90mV
8. Potassium channels close
9. Na/K pump restore resting potential

Question 3

ELECTROCHEMICAL IMPULSES

Resting potential?

Answer 3

Inside of neurons membrane has negative charge

Na pumped out and K pumped in

K can leak out of cell membrane

Inside of membranes negative charge is relative to outside called membrane potential