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Questions and Answers
Which part of the heart is responsible for sending the electrical impulses that start the heartbeat?
Which part of the heart is responsible for sending the electrical impulses that start the heartbeat?
- Atrioventricular node
- Sinoatrial node (correct)
- Purkinje fibers
- Bundle of His
Where is the Sinoatrial node located?
Where is the Sinoatrial node located?
- Left ventricle
- Left atrium
- Right ventricle
- Right atrium (correct)
What is the function of the Bundle of His?
What is the function of the Bundle of His?
- It sends the electrical impulses that start the heartbeat (correct)
- It controls the heart rate
- It controls blood flow through the heart and body
- It is responsible for expanding and contracting different parts of the heart
Which part of the heart is sometimes called the heart's natural pacemaker?
Which part of the heart is sometimes called the heart's natural pacemaker?
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What controls how fast or slowly the Sinoatrial node sends electrical signals?
What controls how fast or slowly the Sinoatrial node sends electrical signals?
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Study Notes
Heart's Electrical System
- The Sinoatrial (SA) node is responsible for sending electrical impulses that start the heartbeat, making it the heart's natural pacemaker.
- The SA node is located in the right atrium, the upper right chamber of the heart.
Bundle of His Function
- The Bundle of His is a group of specialized fibers that carries electrical impulses from the SA node to the ventricles, allowing the ventricles to contract and pump blood.
SA Node Regulation
- The autonomic nervous system controls how fast or slowly the SA node sends electrical signals, regulating heart rate based on the body's needs.
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