Asked by Jennifer Lozano on Jul 21, 2024
Verified
Which of the following events occurs first?
A) Threshold
B) Depolarization
C) Early repolarization
D) Final repolarization
E) Pacemaker potential
Pacemaker Potential
The self-generated electrical potential that triggers the spontaneous depolarization of cells in the heart's pacemaker regions, leading to heartbeat regulation.
Depolarization
A reduction in the difference of electric potential across a cell membrane, leading to the possibility of producing an action potential.
Repolarization
The process by which cells restore their resting negative membrane potential after depolarization.
- Achieve insight into the electrical activity occurring in the heart, with a focus on action potentials in cardiac muscle cells.
Verified Answer
RS
Rajeeb SamantaJul 27, 2024
Final Answer :
E
Explanation :
Pacemaker potential refers to the spontaneous gradual depolarization of the pacemaker cells in the heart, leading up to the threshold point where an action potential is triggered. This occurs before the other listed events in the cardiac action potential sequence.
Learning Objectives
- Achieve insight into the electrical activity occurring in the heart, with a focus on action potentials in cardiac muscle cells.