Sinoatrial Node
Sinoatrial Node - Related Videos
04:39
Sinoatrial Node Isolation from Mouse Model: A Procedure to Harvest SA Node from Murine Heart
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2025
This video demonstrates the procedure to isolate sinoatrial node or SAN from mouse heart. The SAN houses the sinoatrial cells that initiates heartbeat by generating spontaneous action potentials.
09:32
Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
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Cited by 25 •
2016
Methods are demonstrated for the isolation of sinoatrial node myocytes (SAMs) from adult mice for patch clamp electrophysiology or imaging studies. Isolated cells can be used directly or can be maintained in culture to permit expression of proteins of interest, such as genetically encoded reporters.
11:07
High-resolution Optical Mapping of the Mouse Sino-atrial Node
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Cited by 17 •
2016
Here, we present a protocol for optical mapping of electrical activity from the mouse right atrium and especially the sino-atrial node, at a high spatial and temporal resolution.
08:43
Isolation and Culture of Resident Cardiac Macrophages from the Murine Sinoatrial and Atrioventricular Node
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Cited by 4 •
2021
The protocol presented here provides a step-by-step approach for the isolation of cardiac resident macrophages from the sinoatrial node (SAN) and atrioventricular node (AVN) region of mouse hearts.
05:16
Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse
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Cited by 6 •
2020
We provide a step-by-step protocol for whole-mount immunofluorescence staining of the sinoatrial node (SAN) and atrioventricular node (AVN) in murine hearts.
FAQs
Their automaticity arises from gradual ion movements across the cell membrane rather than a single resting state. The hyperpolarization-activated “funny” current contributes to this slow depolarization, while calcium influx helps the membrane reach the level needed for an action potential. This repeating electrical cycle provides the timing signal for successive heartbeats.
The funny current and calcium influx contribute at different stages of pacemaker-cell excitation. The funny current supports the gradual change in membrane voltage that begins the cycle, while calcium entry helps drive the cells to action-potential generation. Together, these ion movements explain how sinoatrial node cells repeatedly reach the electrical threshold required to initiate cardiac signaling.
After the sinoatrial node generates an action potential, the signal spreads through the atria before reaching the atrioventricular node. This pathway establishes an ordered sequence rather than simultaneous activation of all cardiac regions. Studying that progression helps explain how electrical conduction coordinates the timing of atrial and subsequent cardiac contraction.
The sinoatrial node is a central site for investigating how the autonomic nervous system regulates heart rate. Because its pacemaker cells generate recurring electrical activity, changes in their activity provide a mechanism through which nervous-system control can influence the timing of heartbeats. This relationship is important for understanding physiological heart-rate regulation in biology.
Abnormalities involving the sinoatrial node can be studied to clarify how disrupted electrical initiation or propagation affects cardiac rhythm. Research on this tissue connects cellular ion movements with broader conduction problems, including arrhythmias and conduction disorders. Examining both pacemaker-cell activity and signal transmission can help identify where normal cardiac coordination is altered.
The sinoatrial node provides a biological model for designing systems that can generate or support appropriately timed cardiac electrical signals. Its spontaneous depolarization, action-potential generation, and role in initiating conduction are especially relevant design principles. Studying these features helps researchers relate artificial pacing strategies to the heart’s natural mechanism for organizing rhythmic activity.