Active cellular physiology Part III Flashcards
1
Q
Why does the sodium-potassium pump require ATP
A
It works against chemical and electrical gradients.
2
Q
What is depolarization?
A
A process where positive ions (e.g., Na+) enter the cell, making it less negative.
3
Q
What is repolarization?
A
A process where positive ions (e.g., K+) leave the cell, restoring the resting membrane potential.
4
Q
Which cells use depolarization for signaling?
A
Excitable cells, such as neurons and muscle cells.
5
Q
What happens when a cell is placed in a hypotonic solution?
A
Water enters the cell, causing it to swell.
6
Q
What maintains the resting membrane potential?
A
The sodium-potassium exchange pump and passive ion channels.
7
Q
A
