Ion Channels

Question 1

True/False: Ion channel is an integral membrane-spanning protein that when open allows the passage of certain ions.

Answer 1

True

Question 2

What two things do ion channels depend on?

Answer 2

1. size of channel 2. charges lining channel

Question 3

What controls ion channels ability to flow?

Answer 3

Gates

Question 4

What is the probability of a gate being open?

Answer 4

Conductance

Question 5

What are the three types of sensors that control gates?

Answer 5

Voltage-gated channels, second messenger-gated channels, ligand-gated channels

Question 6

What controls a voltage-gated channels?

Answer 6

changes in membrane potential

Question 7

What is an example of a voltage gated channel?

Answer 7

activation gate on Na+ channel is opened by depolarization while inactivation gate is closed by repolarization

Question 8

What controls a second messenger-gated channels?

Answer 8

Changes in intracellular signaling molecules

Question 9

Where are second messenger-gated channels located?

Answer 9

On the side of the ion channel

Question 10

Where are ligand-gated channels located?

Answer 10

extracellular side of ion channel