Electrical Conduction System of the Heart definitions Flashcards

Primary pacemaker of the heart, located in the right atrium, initiating action potentials for heartbeats.

Located in the right atrial wall, it delays action potentials to ensure atria contract before ventricles.

Conducting fibers in the heart's septum, transmitting impulses from the AV node to the ventricles.

Network of fibers spreading impulses through ventricles, ensuring coordinated contraction.

Specialized cardiac cells that depolarize at regular intervals, initiating heartbeats.

Connections between cardiac cells allowing rapid spread of action potentials for synchronized contraction.

External influences that modify heart rate, such as sympathetic and parasympathetic nervous system inputs.

Part of the autonomic nervous system that increases heart rate and contractility during stress.

Part of the autonomic nervous system that decreases heart rate, promoting rest and digestion.

Pathways connecting the SA node to the AV node, facilitating rapid signal transmission across atria.

Process of transmitting action potentials across atria, leading to their contraction.

Contraction of ventricles following atrial contraction, pushing blood into arteries.

Region in the medulla oblongata that increases heart rate via sympathetic stimulation.

Region in the medulla oblongata that decreases heart rate via parasympathetic stimulation.

The strength of heart muscle contraction, influenced by sympathetic nervous system activity.