QuestionSBA
QuestionChoice
This describes the movement of ions during the cells' resting potential. This is maintained by sodium/potassium pumps.
10026940
e
3 sodium ions are pumped out of the cell and 2 potassium ions are pumped into the cell
QuestionChoice
This describes the movement of ions in phase 1 where sodium channels close and potassium channels open briefly.
10026938
c
Potassium ions flow out of the cell through potassium channels
QuestionChoice
Phase 0 describes the rapid depolarisation of cardiac cells. This occurs through a net movement of positive sodium ions into the cell causing membrane potential to become more positive
10026936
a
Sodium ions flow into the cell through sodium channels
QuestionChoice
This describes the movement of ions in phase 2. The flow of calcium ions creates a plateau in membrane potential.
10026939
d
Calcium ions flow into the cell through L-type calcium channels
QuestionChoice
This would cause membrane potential to become more negative and cardiac cells would be unable to reach the threshold potential for depolarisation
10026937
b
Sodium ions flow out of the cell through sodium channels
Concept
Chapter
2693
5938
Cardiac action potentials
Topic
159
Cardiovascular physiology
17785
Which of the following describes the movement of ions during phase 0 of the cardiac action potential?
a