Asked by Angel Aunty on May 10, 2024
Verified
Excess K+ in cardiac tissue causes
A) an increased heart rate.
B) a rapid repolarization of cardiac cells.
C) a decrease in the frequency of action potentials in the conduction system.
D) an increase in stroke volume.
E) an increase in the frequency of action potentials.
Cardiac Tissue
Specialized muscle tissue found in the heart that contracts rhythmically and is responsible for pumping blood throughout the body.
Repolarization
The process by which a cell's membrane potential is restored to its resting state after depolarization.
- Elucidate the impact of ion concentrations outside the cell on the functioning of the heart.
Verified Answer
KP
Karina PassalacquaMay 15, 2024
Final Answer :
C
Explanation :
Excess K+ in cardiac tissue would likely lead to hyperpolarization of cardiac cells, making them less excitable and thus decreasing the frequency of action potentials in the conduction system. This would slow down the heart rate rather than increasing it, affecting the rhythm rather than directly increasing stroke volume or causing rapid repolarization.
Learning Objectives
- Elucidate the impact of ion concentrations outside the cell on the functioning of the heart.