action potential

Question 1

what happens during depolarization (towards 0, then positive)

Answer 1

if stimulus is above threshold
- then sodium channels open and sodium moves into the cell
-inside of the cell becomes less negative&raquo_space; then positive
- moving from high to low concentration, and negative charge inside cell attracts positive charge outside cell

Question 2

what happens during repolarization (back to negative)

Answer 2

• potassium channels open
• potassium moves outside of the cell
• moving from high to low concentration, and negative charge outside cell attracts positive charge from inside

Question 3

what happens during hyperpolarization

Answer 3

• too much potassium moving out of the cell
• negative charge inside cell
• positive charge outside cell

Question 4

what happens during resting potential

Answer 4

• 3 sodium out for every 2 potassium in (through sodium potassium pump)
• happens while neurons aren’t sending the signal

Question 5

what is an action potential

Answer 5

an electrical change in the cell membrane of a neuron which moves down the axoon