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Questions and Answers
During which phase of the cardiac action potential does the absolute refractory period mainly occur?
During which phase of the cardiac action potential does the absolute refractory period mainly occur?
- Phase 1
- Phase 2
- Phase 3
- Phase 0 (correct)
What is the significance of the long refractory period of cardiomyocytes in relation to muscle contraction?
What is the significance of the long refractory period of cardiomyocytes in relation to muscle contraction?
- Enhances the ability to generate multiple action potentials
- Facilitates sustained tetanic contractions
- Allows rapid refilling of ventricles during systole
- Prevents the heart from being tetanized (correct)
Which type of channels are primarily responsible for the rapid depolarization in Phase 0 of the cardiac action potential?
Which type of channels are primarily responsible for the rapid depolarization in Phase 0 of the cardiac action potential?
- Fast Na+ channels (correct)
- L-type Ca2+ channels
- Cl- channels
- K+ channels
What characterizes the relative refractory period in cardiomyocytes?
What characterizes the relative refractory period in cardiomyocytes?
Why can't the heart be tetanized unlike skeletal muscle?
Why can't the heart be tetanized unlike skeletal muscle?
How does the long refractory period of cardiomyocytes contribute to the pumping function of the heart?
How does the long refractory period of cardiomyocytes contribute to the pumping function of the heart?
During which phase of the action potential do Na+ channels recover and become capable of reopening?
During which phase of the action potential do Na+ channels recover and become capable of reopening?
Why do cardiomyocytes have a longer refractory period compared to skeletal muscle cells?
Why do cardiomyocytes have a longer refractory period compared to skeletal muscle cells?
What defines the Absolute Refractory Period in the cardiac muscle?
What defines the Absolute Refractory Period in the cardiac muscle?
What is the mechanical response during the Absolute Refractory Period?
What is the mechanical response during the Absolute Refractory Period?
What characterizes the Relative Refractory Period in cardiac muscle?
What characterizes the Relative Refractory Period in cardiac muscle?
What is the key difference between Absolute and Relative Refractory Periods?
What is the key difference between Absolute and Relative Refractory Periods?
What is the interval of time during which a normal cardiac impulse cannot re-excite an already excited area of cardiac muscle known as?
What is the interval of time during which a normal cardiac impulse cannot re-excite an already excited area of cardiac muscle known as?
Which property describes the ability of the cardiac muscle to generate an action potential followed by contraction?
Which property describes the ability of the cardiac muscle to generate an action potential followed by contraction?
What is the term for the feature of the cardiac muscle that makes it capable of responding to an adequate stimulus?
What is the term for the feature of the cardiac muscle that makes it capable of responding to an adequate stimulus?
Which of the following principles states that once a threshold stimulus is reached, the cardiomyocyte responds with a complete contraction?
Which of the following principles states that once a threshold stimulus is reached, the cardiomyocyte responds with a complete contraction?
During which period does the cardiac muscle have reduced excitability but could respond to a very strong stimulus?
During which period does the cardiac muscle have reduced excitability but could respond to a very strong stimulus?
Which term describes the ability of the heart muscle to transmit electrical impulses efficiently?
Which term describes the ability of the heart muscle to transmit electrical impulses efficiently?
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