MED 315 - Cardiac Electrophysiology Quiz

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What is the primary function of the heart?

Generating electrical signals for the body

Conducting action potentials in the myocardium

Pumping blood through the vasculature (correct)

Regulating the autonomic nervous system

Where does the cardiac action potential normally originate?

Myocardium

Ventricles

Atria

Sinoatrial (SA) node (correct)

Why is the sequence of electrical activation and contraction in the heart critical?

To modulate heart rate through the autonomic nervous system

To ensure efficient ejection of blood from the ventricles (correct)

To regulate excitability and refractory periods

To maintain stable conduction velocity in the myocardium

What modulating effects does the autonomic nervous system have on the heart?

Influencing heart rate, conduction velocity, and excitability Signup and view all the answers

In which specific sequence must the ventricles contract for efficient ejection of blood?

From apex to base Signup and view all the answers

Where is the action potential initiated in a normal heart?

SA node Signup and view all the answers

What is the function of conducting cells in the heart?

To rapidly spread action potentials over the entire myocardium Signup and view all the answers

What is the significance of slow conduction velocity through the AV node?

Ensures that the ventricles have sufficient time to fill with blood before they contract Signup and view all the answers

Which part of the heart has the capacity to generate action potentials spontaneously?

SA node Signup and view all the answers

What is the primary function of contractile cells in the heart?

Lead to contraction and generation of force or pressure Signup and view all the answers

What are the main components of cardiac electrophysiology?

The main components of cardiac electrophysiology include the cardiac action potentials, conduction of action potentials, excitability and refractory periods, modulating effects of the autonomic nervous system, and the electrocardiogram (ECG). Signup and view all the answers

Why is the specific sequence of electrical activation and contraction in the heart critical?

The specific sequence is critical because the atria must be activated and contract before the ventricles, and the ventricles must contract from apex to base for efficient ejection of blood. Signup and view all the answers

Where does the cardiac action potential normally originate in the heart?

The cardiac action potential normally originates in the sinoatrial (SA) node. Signup and view all the answers

What is the ultimate function of the heart in terms of pumping?

The ultimate function of the heart is to pump blood through the vasculature. Signup and view all the answers

What must occur before the ventricles contract for efficient ejection of blood?

Before the ventricles contract for efficient ejection of blood, the atria must be activated and contract. Signup and view all the answers

What is the primary function of conducting cells in the heart?

Rapidly spread action potentials over the entire myocardium Signup and view all the answers

What is the specific sequence and timing for the conduction of action potentials to the rest of the heart after initiation in the SA node?

SA node, atrial internodal tracts and atria, AV node, Bundle of His, Purkinje system, and ventricles Signup and view all the answers

What is the significance of slow conduction velocity through the AV node?

Ensures that the ventricles have sufficient time to fill with blood before they are activated and contract Signup and view all the answers

Where does the action potential spread from the SA node?

Atrial internodal tracts and atria, and simultaneously to the AV node Signup and view all the answers

What is the role of the bundle of His and the Purkinje system in the electrical activation of the heart?

Rapidly distribute the action potential to the ventricles Signup and view all the answers

MED 315 - Cardiac Electrophysiology Quiz

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Questions and Answers

What is the primary function of the heart?

Where does the cardiac action potential normally originate?

Why is the sequence of electrical activation and contraction in the heart critical?

What modulating effects does the autonomic nervous system have on the heart?

In which specific sequence must the ventricles contract for efficient ejection of blood?

Where is the action potential initiated in a normal heart?

What is the function of conducting cells in the heart?

What is the significance of slow conduction velocity through the AV node?

Which part of the heart has the capacity to generate action potentials spontaneously?

What is the primary function of contractile cells in the heart?

What are the main components of cardiac electrophysiology?

Why is the specific sequence of electrical activation and contraction in the heart critical?

Where does the cardiac action potential normally originate in the heart?

What is the ultimate function of the heart in terms of pumping?

What must occur before the ventricles contract for efficient ejection of blood?

What is the primary function of conducting cells in the heart?

What is the specific sequence and timing for the conduction of action potentials to the rest of the heart after initiation in the SA node?

What is the significance of slow conduction velocity through the AV node?

Where does the action potential spread from the SA node?

What is the role of the bundle of His and the Purkinje system in the electrical activation of the heart?

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