1
Q
Ion channels
A
proteins that form pores in the plasma membrane
2
Q
What are ion channels categorized by?
A
- Gating (opening and closing) mechanism
- Ion selectivity
- Pharmacology
- If they are passive
3
Q
What determines the direction of flow through an ion channel?
A
- Concentration gradient
- Electrical gradient
4
Q
Potassium is ___ inside the cell and ____ outside the cell
A
high; low
5
Q
Sodium is ___ inside the cell and ____ outside the cell
A
low; high
6
Q
Calcium is ____ inside the cell and ____ outside the cell
A
very low; high
7
Q
Membrane potential is set by ___ peermeability at rest
A
Potassium
8
Q
What ions do not cross the cell membrane?
A
Negatively charged
