13 Neuronal Communication

Question 1

what keeps a resting potential in place at ____ mV?

Answer 1

70mV
SODIUM/POTASSIUM ATP PUMP CREATES A VOLTAGE DIFFERENTIAL ACROSS THE MEMBRANE BY MOVING 3 NA+ OUT FOR EVERY 2 K+ IN, USING ATP (net negative charge inside cell compared to outside cell)

NA+ ION V-G CHANNELS

K+ ION V-G CHANNELS

Question 2

what keeps a resting potential in place at ____ mV?

Answer 2

70mV
SODIUM/POTASSIUM ATP PUMP CREATES A VOLTAGE DIFFERENTIAL ACROSS THE MEMBRANE BY MOVING 3 NA+ OUT FOR EVERY 2 K+ IN, USING ATP (net negative charge inside cell compared to outside cell)

NA+ ION V-G CHANNELS ARE CLOSED

K+ ION V-G CHANNELS ARE OPEN

Question 3

what is an action potential?

Answer 3

NA+ ION V-G CHANNELS OPEN, ONCE REACHING THRESHOLD (-40mV) MANY MORE CHANNELS OPEN, NA+ FLOODS THE CELL (DEPOLARISATION)

Question 4

what is an action potential?

Answer 4

NA+ ION V-G CHANNELS OPEN, ONCE REACHING THRESHOLD (-40mV) MANY MORE CHANNELS OPEN, NA+ FLOODS THE CELL (DEPOLARISATION)

NA+ ION V-G CHANNELS CLOSE, K+ ION V-G CHANNELS OPEN (REPOLARISATION) K+ IONS MOVE OUT OF CELL DOWN ELECTROCHEMICAL AND CONCENTRATION GRADIENTS

Question 5

what is a node of ranvier and its function?

Answer 5

TO ALLOW SALTATORY CONDUCTION BETWEEN THE SECTIONS OF MYELIN SHEATH, SPEEDING UP THE TRANSMISSION OF AN ACTION POTENTIAL