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Which component of conduction pathway of...

Which component of conduction pathway of heartis responsible for maintaining the contractile activity of the heart ?

A

SA node

B

AV node

C

Bundle of His

D

Purkinje fibres

Text Solution

AI Generated Solution

The correct Answer is:
To determine which component of the conduction pathway of the heart is responsible for maintaining the contractile activity of the heart, we can analyze the options provided: 1. **Sinoatrial (SA) Node**: - The SA node is known as the natural pacemaker of the heart. It generates electrical impulses that initiate the heartbeat and cause the atria (the upper chambers of the heart) to contract. However, while it initiates the heartbeat, it does not directly maintain the contractile activity of the heart. **Hint**: Consider what initiates the heartbeat versus what maintains the rhythm and contraction of the heart. 2. **Atrioventricular (AV) Node**: - The AV node serves as a critical component in the conduction pathway. It receives the electrical signals from the SA node and delays them slightly before passing them to the ventricles. This delay allows the atria to finish contracting and ensures that the ventricles fill with blood before they contract. The AV node plays a vital role in coordinating the contraction of the heart, making it essential for maintaining the contractile activity. **Hint**: Think about which part of the conduction system coordinates the timing between the atria and ventricles. 3. **Bundle of His**: - The Bundle of His is responsible for transmitting the electrical impulses from the AV node to the ventricles through the bundle branches. While it is important for conducting impulses, it does not directly maintain the contractile activity of the heart. **Hint**: Focus on the role of this structure in the conduction pathway rather than its role in contraction. 4. **Purkinje Fibers**: - Purkinje fibers are specialized fibers that spread throughout the ventricles and help in the synchronized contraction of the ventricles. They conduct the impulses rapidly but are not responsible for maintaining the overall contractile activity of the heart. **Hint**: Consider the role of these fibers in the context of ventricular contraction. **Conclusion**: After analyzing all the options, the component of the conduction pathway that is responsible for maintaining the contractile activity of the heart is the **Atrioventricular (AV) Node**. **Final Answer**: The AV node is responsible for maintaining the contractile activity of the heart. ---
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