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Questions and Answers
What is the primary function of the Sinoatrial (SA) Node in the heart?
What is the primary function of the Sinoatrial (SA) Node in the heart?
- To initiate electrical impulses for heartbeats (correct)
- To delay electrical signals before ventricular contraction
- To transmit impulses to the ventricles
- To spread electrical signals throughout the atria
Which component of the heart is responsible for delaying the electrical signal?
Which component of the heart is responsible for delaying the electrical signal?
- Purkinje Fibers
- Sinoatrial (SA) Node
- Bundle of His
- Atrioventricular (AV) Node (correct)
Where are Purkinje Fibers located?
Where are Purkinje Fibers located?
- Near the septum between atria and ventricles
- At the base of the heart
- In the right atrium
- In the ventricular walls (correct)
What role does the Bundle of His play in the heart's electrical system?
What role does the Bundle of His play in the heart's electrical system?
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What is the function of the Atrioventricular (AV) Node in the heartbeat process?
What is the function of the Atrioventricular (AV) Node in the heartbeat process?
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Study Notes
Heart Electrical Components
- The heart is a muscular pump responsible for circulating blood throughout the body.
- The heart's pumping action is regulated by electrical signals that trigger muscle contractions and relaxation.
Sinoatrial (SA) Node
- The SA node is situated in the right atrium and is often referred to as the "natural pacemaker" of the heart.
- It initiates the electrical impulses that control heart contractions.
Atrioventricular (AV) Node
- Located in the right atrial wall, near the septum separating the atria and ventricles.
- It delays the electrical signal, allowing the ventricles to fill with blood before they contract.
Bundle of His
- This bundle transmits impulses through the septum to the ventricles.
Purkinje Fibers
- They are found in the ventricular walls.
- These fibers distribute the electrical signals throughout the ventricles, causing them to contract.
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