Podcast
Questions and Answers
What is the resting membrane potential of a cardiomyocyte?
What is the resting membrane potential of a cardiomyocyte?
- -90 millivolts (correct)
- -80 millivolts
- -100 millivolts
- -70 millivolts
What is the cardiac pacemaker potential?
What is the cardiac pacemaker potential?
- An action potential in the respiratory system of the heart
- An action potential in the nervous system controlling the heart
- An action potential in the electrical conduction system of the heart (correct)
- An action potential in the muscular contraction of the heart
What are the three channels of interest in the cardiac action potential?
What are the three channels of interest in the cardiac action potential?
- slow sodium channels, potassium channels, and L-type voltage-gated calcium channels
- fast potassium channels, chloride channels, and L-type voltage-gated calcium channels
- fast sodium channels, potassium channels, and L-type voltage-gated calcium channels (correct)
- fast sodium channels, potassium channels, and N-type voltage-gated calcium channels
What are the two separate action potentials to consider in the heart?
What are the two separate action potentials to consider in the heart?
What is responsible for the depolarization phase in the cardiac action potential?
What is responsible for the depolarization phase in the cardiac action potential?
Which part of the heart does the pacemaker potential apply to?
Which part of the heart does the pacemaker potential apply to?
Which channels open after sodium channels close during the cardiac action potential?
Which channels open after sodium channels close during the cardiac action potential?
What are the three types of voltage-gated channels that the pacemaker potential relies on?
What are the three types of voltage-gated channels that the pacemaker potential relies on?
When does the sodium channel automatically open during the pacemaker potential?
When does the sodium channel automatically open during the pacemaker potential?
What is the plateau phase in the cardiac action potential due to?
What is the plateau phase in the cardiac action potential due to?
What happens when the calcium channel opens during the pacemaker potential?
What happens when the calcium channel opens during the pacemaker potential?
What does the plateau phase allow the chamber to do during the cardiac action potential?
What does the plateau phase allow the chamber to do during the cardiac action potential?
When does the potassium channel open during the pacemaker potential?
When does the potassium channel open during the pacemaker potential?
What happens to calcium channels and potassium channels during repolarization in the cardiac action potential?
What happens to calcium channels and potassium channels during repolarization in the cardiac action potential?
What brings the cardiomyocyte back to resting membrane potential during the cardiac action potential?
What brings the cardiomyocyte back to resting membrane potential during the cardiac action potential?
Why is the pacemaker potential an unstable membrane potential?
Why is the pacemaker potential an unstable membrane potential?
What can stimulate another action potential in adjacent cardiomyocytes or cells of the electrical conduction system?
What can stimulate another action potential in adjacent cardiomyocytes or cells of the electrical conduction system?
Does the heart's autorhythmicity require nervous system input?
Does the heart's autorhythmicity require nervous system input?
Which of the following ions is not mentioned as part of the cardiac action potential?
Which of the following ions is not mentioned as part of the cardiac action potential?
How does the vagus nerve affect heart rate?
How does the vagus nerve affect heart rate?
Study Notes
- The video is about the cardiomyocyte or cardiac action potential.
- The resting membrane potential of a cardiomyocyte is around -90 millivolts.
- There are three channels of interest: fast sodium channels, potassium channels, and L-type voltage-gated calcium channels.
- The depolarization phase is due to the rapid influx of sodium ions.
- Potassium channels and L-type calcium channels open after sodium channels close.
- The plateau phase, unique to cardiac muscle, is due to the balance between calcium influx and potassium efflux.
- The plateau phase allows the chamber to finish pumping blood efficiently.
- Calcium channels close, and potassium channels remain open during repolarization.
- The repolarization phase brings the cardiomyocyte back to resting membrane potential.
- Adjacent cardiomyocytes or cells of the electrical conduction system can stimulate another action potential.
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Description
"Test your knowledge on Cardiomyocyte Action Potential! Learn about the three channels involved, the depolarization and repolarization phases, and the unique plateau phase. Discover how adjacent cells stimulate another action potential and understand the importance of this process for efficient blood pumping. Challenge yourself with this quiz and master the fundamentals of cardiac electrophysiology today!"
