Asked by Brenden Elkins on Jun 16, 2024
Verified
What action is most responsible for the resting membrane potential in cardiac muscle cells?
A) Movement of K+ through voltage-gated K+ channels
B) Movement of Na+ through open Na+ channels
C) Movement of Ca2+ through voltage-gated Ca2+ channels.
D) Closing of Na+ and K+ voltage-gated channels
Resting Membrane Potential
The voltage difference across a cell's plasma membrane in the absence of stimulation, crucial for the transmission of nerve impulses.
Cardiac Muscle Cells
Specialized muscle cells in the heart that contract to pump blood throughout the body; also known as cardiomyocytes.
Voltage-Gated Channels
Protein channels that open or close in response to changes in the membrane potential.
- Describe the processes responsible for resting and action potentials in cardiac muscle cells.
Verified Answer
TT
Tracy TaylorJun 22, 2024
Final Answer :
A
Explanation :
The movement of K+ (potassium ions) through voltage-gated K+ channels is most responsible for the resting membrane potential in cardiac muscle cells, as K+ efflux out of the cell is a key factor in establishing the negative charge inside the cell relative to the outside.
Learning Objectives
- Describe the processes responsible for resting and action potentials in cardiac muscle cells.