Asked by Amanda Marie on Apr 27, 2024
Verified
The plateau phase seen during the action potential of a cardiac muscle cell is due to the
A) sodium-potassium pump.
B) opening of Na+ channels.
C) continuing to have open Ca2+ channels.
D) closure of Cl− channels.
E) closing of Ca2+ channels.
Plateau Phase
Prolongation of the depolarization phase of a cardiac muscle cell membrane; results in a prolonged refractory period.
Cardiac Muscle Cell
Cardiac muscle cell, also known as a cardiomyocyte, is a specialized type of muscle cell found in the heart that contracts to pump blood throughout the body.
Action Potential
The process by which nerve cells generate an electrical signal after being stimulated, involving a dramatic change in charge across the cell membrane.
- Develop an understanding of the electrical dynamics of the heart, notably action potentials in cardiac muscle cells.
Verified Answer
ZK
Zybrea KnightMay 04, 2024
Final Answer :
C
Explanation :
The plateau phase of a cardiac muscle cell's action potential is primarily due to the opening of calcium channels, which allows Ca2+ ions to enter the cell, maintaining depolarization for a longer period.
Learning Objectives
- Develop an understanding of the electrical dynamics of the heart, notably action potentials in cardiac muscle cells.