Chapter 4

Question 1

At which of the action potential does the inside of the cell become positive in relation to the outside?

Answer 1

Overshoot

Question 2

_____is when the Vm becomes more positive

Answer 2

Depolarization

Question 3

What is the period of time called when it’s impossible to generate an action potential?

Answer 3

Absolute refractory period

Question 4

Which channel can be transgenically inserted into a cell to cause depolarization in response to blue light?

Answer 4

Channelrhodosin- 2

Question 5

What causes the falling phase of the action potential?

Answer 5

Efflux of K

Question 6

By which method can we study the properties of transmembrane channels?

Answer 6

Patch clamp

Question 7

Which toxin from puffer fish blocks sodium channels and is usually fatal if ingested?

Answer 7

Tetrodotoxin

Question 8

When do voltage-gated potassium channels open?

Answer 8

Slowly after depolarization

Question 9

An action potential traveling in one direction is called

Answer 9

Orthodromic

Question 10

Action potential velocity increases with

Answer 10

Increasing diameter