Heart's Conduction System Overview

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Questions and Answers

Which structure is primarily responsible for conducting electrical impulses in the heart?

Purkinje fibres
Bundle of His (correct)
Sinoatrial node
Atrioventricular node

Which of the following is not a part of the cardiac conduction system?

Atrioventricular bundle
Coronary arteries (correct)
Bundle of His
Purkinje fibres

How does the conduction velocity of the atrioventricular node compare to that of the atria?

Equal
Variable
Slower (correct)
Faster

What is the primary function of Purkinje fibres in the heart?

Conducting impulses to the ventricles (A) Signup and view all the answers

Which of these structures receives impulses directly before they spread into the ventricles?

Atrioventricular node (B) Signup and view all the answers

Which statement correctly describes the conduction speed in the heart's AV node relative to the atria?

It is slower than the atria (B) Signup and view all the answers

What characterizes the conduction velocity of the AV node in comparison to the atrial tissue?

It is uniformly slower (B) Signup and view all the answers

In which part of the heart is the Bundle of His located?

Interventricular septum (B) Signup and view all the answers

In terms of conduction velocity, how does the AV node behave compared to the atria?

It has a slower conduction velocity (C) Signup and view all the answers

Which of the following best describes the conduction characteristics of the AV node versus the atrial myocardium?

Conduction is slower in the AV node (A) Signup and view all the answers

What is the primary function of the sinoatrial node (SAN) in the heart?

Regulate heart rate (D) Signup and view all the answers

Where is the sinoatrial node (SAN) situated within the heart?

Right atrium (D) Signup and view all the answers

Which structure is primarily responsible for initiating the electrical impulses that regulate heart contractions?

Sinoatrial node (D) Signup and view all the answers

What role does the sinoatrial node (SAN) play in heart health?

Regulating heart rate (C) Signup and view all the answers

Which of the following statements about the sinoatrial node is incorrect?

It is located in the left atrium. (D) Signup and view all the answers

Which part of the heart's conduction system receives electrical impulses from the atria?

Atrioventricular node (AVN) (C) Signup and view all the answers

What is the primary function of the Sinoatrial node (SAN)?

Initiate electrical impulses (C) Signup and view all the answers

Which structure follows the Atrioventricular node (AVN) in the heart's conduction pathway?

Bundle of His (C) Signup and view all the answers

What role do Purkinje fibres play in the heart's conduction system?

Distribute impulses to ventricular muscle (D) Signup and view all the answers

What is the significance of the atrioventricular node (AVN) in the heart's conduction system?

Slows down impulses before reaching ventricles (D) Signup and view all the answers

What is the primary function of the Purkinje fibres in the heart's conduction system?

Transmit the wave of electricity to the ventricular myocardium (C) Signup and view all the answers

Which of the following is NOT a function of the Purkinje fibres?

Launch the cardiac cycle (C) Signup and view all the answers

Which part of the heart is primarily activated by the Purkinje fibres?

Ventricular myocardium (A) Signup and view all the answers

What activates the Purkinje fibres within the cardiac conduction system?

Pacemaker activity of the sinoatrial node (D) Signup and view all the answers

What would likely happen if the Purkinje fibres malfunctioned?

Irregular ventricular contraction (C) Signup and view all the answers

What is the conduction velocity of the atrial muscle?

0.05 m/sec (A) Signup and view all the answers

How does the conduction velocity of the atrial muscle compare to that of the AV node?

It is slower than the AV node (B) Signup and view all the answers

Which structure has a slower conduction velocity than atrial muscle?

AV node (C) Signup and view all the answers

What is a characteristic feature of atrial muscle conduction?

Relatively slow conduction speed (C) Signup and view all the answers

Which of the following speeds is NOT associated with atrial muscle conduction?

0.40 m/sec (B), 0.20 m/sec (C), 0.30 m/sec (D) Signup and view all the answers

Flashcards

Stimulate ventricular muscles

actions that cause the muscles of the ventricles to contract

Sinoatrial node (SAN) location

Located in the right atrium of the heart.

AVN Conduction Velocity

The speed at which electrical signals travel through the atrioventricular node (AVN) is slower compared to the atria.

Heart's Conduction System

A network of specialized cells that transmit electrical impulses to coordinate the heart's pumping action.