Chapter 5- Membrane Potentials And Action Potentials

Question 1

Most abundant ICF ion

Answer 1

POTASSIUM

Question 2

Diffusion potential level acroos a membrane that exactly opposes the net diffusion of particular ion through the membrane

Answer 2

Nernst Potential

Question 3

Is used to calculate the diffusion potential when the membrane is permeable to several different ions

Answer 3

GOLDMAN EQUATION

Question 4

Resting membrane potential of nerve

Answer 4

-90 millivolts

Question 5

Electrogenic pump

Answer 5

Sodium - Potassium pump (3Na-2K)

Question 6

Other name of potassium leak channel

Answer 6

1.) Tandem pore domain 2.) Potassium channel

Question 7

2 Cause of plateau in cardiac muscle

Answer 7

1. ) Voltage activated sodium channel (fast channel)

2. ) calcium channel (slow channel)

Question 8

Resting potential in heart

Answer 8

-60 to -70 mV

Question 9

Increase outflow of potassium causes

Answer 9

Hyperpolarization * prevents repolarization until membrane potential evens out

Question 10

Action potentials are conducted from node to node

Answer 10

Saltatory Conduction

• purpose
  1. ) the mechanism increases velocity of nerve transmission
  2. ) conserves energy