lab exam: Action potential

Question 1

concentration of NA+ inside the cell different from the concentration outside the cell ( and how is K+)

Answer 1

Na+  = high concentration outside/ low inside
K+ = low concentration outside/ high concentration inside

Question 2

what maintains the unequal distribution of ions

Answer 2

ATPase maintains it

Question 3

Membrane Potential( what does the sign mean)

Answer 3

electrical charge difference inside the cell verus outside
- the sign in front of the membrane potential value indicates if the inside of the cell is negative or more positive)

at rest the inside of the cell is more negatively charged
during an AP the cell becomes more positively charged

Question 4

Action potential

Answer 4

signaling mechanism in which the inside of the cell becomes rapidly positive ( depolarization)

Question 5

Refractory period

Answer 5

2 types absolute and relative

Question 6

absolute refractory period

Answer 6

time following an ap, no action potential. sodium channels are open or in an inactive state.

Question 7

relative refractory period

Answer 7

when a nerve axon will produce an action potential if a stronger stimulus voltage is applied.
( sodium channels r still inactive , rest to activate)