Podcast
Questions and Answers
What is the main function of the SA node in the heart?
What is the main function of the SA node in the heart?
- To slow down heart rate
- To excite itself and generate electrical impulses (correct)
- To regulate blood pressure
- To conduct electrical signals from atria to ventricles
Which ion plays a crucial role in maintaining the resting potential of -70mV in heart muscle cells?
Which ion plays a crucial role in maintaining the resting potential of -70mV in heart muscle cells?
- Chloride (Cl-)
- Potassium (K+) (correct)
- Sodium (Na+)
- Calcium (Ca2+)
Why is a refractory period necessary for the heart muscle?
Why is a refractory period necessary for the heart muscle?
- To prevent electrical conduction between atria and ventricles
- To allow relaxation and filling of the heart chambers (correct)
- To maintain a steady heart rate
- To speed up contractions
What is the function of the Bundle of His in the heart's conduction system?
What is the function of the Bundle of His in the heart's conduction system?
In which phase of the action potential does repolarization occur?
In which phase of the action potential does repolarization occur?
What is the role of Na+/K+ pump in maintaining the resting potential of heart muscle cells?
What is the role of Na+/K+ pump in maintaining the resting potential of heart muscle cells?
How does an ECG detect electrical activity in the heart?
How does an ECG detect electrical activity in the heart?
Which statement accurately describes Purkinje fibers' role in heart conduction?
Which statement accurately describes Purkinje fibers' role in heart conduction?
What abnormality is associated with a vector pointing away from an area with myocardial infarction on an ECG?
What abnormality is associated with a vector pointing away from an area with myocardial infarction on an ECG?
What effect does hyperpolarization have on heart muscle cells?
What effect does hyperpolarization have on heart muscle cells?
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