exam 3

Question 1

what change in Vm is more positive(stimulates)

Answer 1

depolarization

Question 2

what change in Vm is more negative(inhibits)

Answer 2

hyperpolarization

Question 3

what is the change when Vm returns toward resting after a change in Vm

Answer 3

repolarization

Question 4

how many types of conduction are ther

Answer 4

2

Question 5

what type of conduction is solely in myelinated axons?

Answer 5

saltatory

Question 6

what type of conduction is in unmyelinated axons and the membrane of other cells that can generate action potential?

Answer 6

continuous

Question 7

what does the membrane of a cell seperate?

Answer 7

charges

Question 8

what does seperation of charges create?

Answer 8

a membrane potential (Vm)

Question 9

formula for finding membrane potential

Answer 9

Vm=(inner membrane charge)-(outer membrane charge)

Question 10

what do the charges that are “stuck” to the inner and outer membrane do?

Answer 10

they contribute to membrane potential (Vm)

Question 11

what element has the biggest permeability at rest?

Answer 11

K+

Question 12

what does Na+ and K+ pump do in the interstitial compartment?

Answer 12

creates the Na+ and K+ gradients, has a role in generating Vm

Question 13

resting Vm; positive or negative? relative mv?

Answer 13

negative, ~ -40mv to ~ -90mv

Question 14

what is the permeability of sodium(PNa) in Na+ channels?

Answer 14

~0.05

Question 15

what is the permeability of K+ in K+ channels?

Answer 15

~1.0

Question 16

what is the permeability of Cl- in Cl- channels?

Answer 16

~0.45

Question 17

during resting Vm what element(s) go in? which go out?

Answer 17

Na+, Cl-;K+

Question 18

what does an increase in extracellular Na+ cause? a decrease?

Answer 18

depolarization; hyperpolarization

Question 19

what does an increase in extracellular K+ cause? a decrease?

Answer 19

depolarization; hyperpolarization

Question 20

what does an increase in extracellular Cl- cause? a decrease?

Answer 20

hyperpolarization; depolarization

Question 21

what does an increase in intracellular Na+ cause? a decrease?

Answer 21

hyperpolarization; depolarization

Question 22

what does an increase in intracellular K+ cause? a decrease?

Answer 22

hyperpolarization; depolarization

Question 23

what does an increase in intracellular Cl- cause? a decrease?

Answer 23

depolarization; hyperpolarization