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What structure primarily controls the heartbeat in the human body?
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18. The Heart
Electrical Conduction System of the Heart
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Which component of the heart's electrical conduction system is responsible for initiating the heartbeat?
A
Sinoatrial (SA) node
B
Purkinje fibers
C
Atrioventricular (AV) node
D
Bundle of His
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Understand the heart's electrical conduction system, which is responsible for controlling the heartbeat through a series of electrical impulses.
Identify the key components of the heart's conduction system: the Sinoatrial (SA) node, Atrioventricular (AV) node, Bundle of His, and Purkinje fibers.
Learn that the Sinoatrial (SA) node is located in the right atrium and is known as the heart's natural pacemaker because it initiates the electrical impulse that starts the heartbeat.
Recognize that the electrical impulse from the SA node travels through the atria, causing them to contract, and then reaches the Atrioventricular (AV) node.
Understand that the impulse continues through the Bundle of His and Purkinje fibers, leading to the contraction of the ventricles, completing the heartbeat cycle.
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