1 L2 Ions, Fluids, Gradients, Channels

Question 1

What are the 3 important properties of ion channels

Answer 1

Selectivity - Gating - Conductance

Question 2

Define selectivity of ion channels

Answer 2

Allowing only specific ions or types to transit

Question 3

Define conductance of ion channels

Answer 3

How many ions can cross per unit of time

Question 4

Define gating of ion channels

Answer 4

External influences may act on a channel to cause a change in conductivity e.g. mechanical, chemical, electrical

Question 5

What is ion flux through a channel measured in

Answer 5

Electrical current

Question 6

True or False- Conductance can only be linear

Answer 6

False- Conductance can be linear or non-linear

Question 7

True or False- Carriers are open to both ICF and ECF at the same time

Answer 7

False- Typically they are only open to 1 at a time

Question 8

What are the 2 types of secondary active transporters

Answer 8

Symporters and Antiporters

Question 9

Describe a symporter

Answer 9

Moves 2 substances in the same direction- 1 down it’s concentration gradient, 1 against it’s concentration gradient

Question 10

Describe an antiporter

Answer 10

Moves 2 substances in the opposite direction- 1 down it’s concentration gradient, 1 against it’s concentration gradient

Question 11

What are the 4 main kinds of ion channel gating

Answer 11

Chemical - Voltage - Mechanical - Phosphorylation