Electrocardiogram (ECG) Basics

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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?

Chloride (Cl-)

Potassium (K+) (correct)

Sodium (Na+)

Calcium (Ca2+)

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?

To provide an electrical connection between atria and ventricles Signup and view all the answers

In which phase of the action potential does repolarization occur?

Repolarization Signup and view all the answers

What is the role of Na+/K+ pump in maintaining the resting potential of heart muscle cells?

It maintains ion concentrations inside and outside the cell Signup and view all the answers

How does an ECG detect electrical activity in the heart?

By detecting electrical fields of muscle fibers Signup and view all the answers

Which statement accurately describes Purkinje fibers' role in heart conduction?

They conduct action potentials from the apex of the heart upwards Signup and view all the answers

What abnormality is associated with a vector pointing away from an area with myocardial infarction on an ECG?

Thickened left ventricular wall Signup and view all the answers

What effect does hyperpolarization have on heart muscle cells?

It maintains the resting potential after repolarization Signup and view all the answers

Electrocardiogram (ECG) Basics

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Questions and Answers

What is the main function of the SA node in the heart?

Which ion plays a crucial role in maintaining the resting potential of -70mV in heart muscle cells?

Why is a refractory period necessary for the heart muscle?

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?

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?

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 effect does hyperpolarization have on heart muscle cells?

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