48.3 Generation of Action Potential: A Closer Look

Question 1

how does action potentials convey information about signal strength?

Answer 1

the frequency with which a neuron generates action potentials can vary in response to input
-differences in action potential frequency convey information about signal strength

Question 2

action potential

Answer 2

• gated ion channels change membrane potential
• voltage ion channel open in response to change in membrane potential
• voltage ion channel creates further deplorization
• threshold
• action potential is triggered

Question 3

Sodium channels vs potassium channels

Answer 3

sodium: open first - initiate the action potential
when action potential proceeds, the sodium channels become inactivated
and remains inactivated until membrane returns to resting potential and channels close

potassium: open slower -
remain open and functional throughout the action potential

Question 4

1

Answer 4

at resting potential most voltage gates sodium channels are closed
-most voltage gated potassium channels are closed

Question 5

2

Answer 5

-stimulus depolarizes the membrane