Asked by Kaitlynn Garcia on Jul 21, 2024
Verified
Which sequence does the electrical stimulus of the cardiac cycle follow?
A) AV node SA node bundle of His
B) Bundle of His AV node SA node
C) SA node AV node bundle of His bundle branches
D) AV node SA node bundle of His bundle branches
SA Node
The sinoatrial node, often regarded as the heart's natural pacemaker, initiates electrical impulses that determine the heart rate.
AV Node
The Atrioventricular Node, a critical component of the heart's electrical system, responsible for controlling the timing of heart muscle contractions.
Bundle of His
A group of specialized heart muscle cells that are designed for electrical signaling, responsible for carrying impulses from the AV node to the heart's ventricles.
- Recognize the elements of the heart's conduction system and comprehend their functions.
Verified Answer
KM
Karisma MartinezJul 27, 2024
Final Answer :
D
Explanation :
Specialized cells in the SA node near the superior vena cava initiate an electrical impulse. The current flows in an orderly sequence, first across the atria to the AV node low in the atrial septum. There it is delayed slightly, allowing the atria the time to contract before the ventricles are stimulated. Then the impulse travels to the bundle of His, the right and left bundle branches, and then through the ventricles.
Learning Objectives
- Recognize the elements of the heart's conduction system and comprehend their functions.