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Questions and Answers
What is the property of self-excitation of the heart called?
Which part of the heart exhibits the highest Rhythmicity?
What is the normal resting membrane potential (RMP) of the Sinoatrial Node (SAN)?
What causes the gradual depolarization in the mechanism of autorhythmicity?
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What characterizes the upstroke depolarization in the rest of the heart muscle?
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What is the normal resting membrane potential (RMP) of the rest of the heart muscle?
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What characterizes the upstroke depolarization in the Sinoatrial Node (SAN)?
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What happens to the heart rate when the Sinoatrial Node (SAN) is cooled?
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What is responsible for the property of self-excitation of the heart?
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What is the highest Rhythmicity exhibited by in the heart?
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Study Notes
Heart Physiology
- The property of self-excitation of the heart is called autorhythmicity.
Rhythmicity in the Heart
- The sinoatrial node (SAN) exhibits the highest rhythmicity in the heart.
Membrane Potential
- The normal resting membrane potential (RMP) of the sinoatrial node (SAN) is -60mV to -70mV.
- The normal resting membrane potential (RMP) of the rest of the heart muscle is -90mV.
Mechanism of Autorhythmicity
- The gradual depolarization in the mechanism of autorhythmicity is caused by the inward leak of sodium ions and the outward leak of potassium ions.
Upstroke Depolarization
- The upstroke depolarization in the rest of the heart muscle is characterized by the rapid influx of sodium ions.
- The upstroke depolarization in the sinoatrial node (SAN) is characterized by the rapid influx of calcium ions.
Response to Cooling
- When the sinoatrial node (SAN) is cooled, the heart rate slows down.
Autorhythmicity
- The sinoatrial node (SAN) is responsible for the property of self-excitation of the heart, also known as autorhythmicity.
- The sinoatrial node (SAN) exhibits the highest rhythmicity in the heart.
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Description
Test your knowledge of the properties of the cardiac pacemaker, including automaticity, rhythmicity, and the role of the sinoatrial node (SAN) in heart function.
