First, the sinoatrial, or SA, node sets your “resting” heart rate, usually somewhere between 60 and 100 beats per minute.

The size and the position of the sinoatrial node are normal (Figs. 1 and 2). Figure 1 HNK-1 antigen expression (brown) in transverse sections ( a – f ) of a 7-wk-old human embryo with complete ...

The sinoatrial (SA) node is the natural pacemaker of the heart. It generates electrical impulses that cause the heart’s chambers to contract, setting the heart rate. The SA node typically ...

Third-degree sinoatrial exit block occurs when no SA nodal action potentials are able to leave the SA node. No P waves are seen on the ECG. When a junctional escape ensues, the rhythm may be ...

Phosphorylation and modulation of hyperpolarization-activated HCN4 channels by protein kinase A in the mouse sinoatrial node. The Journal of General Physiology , 2010; DOI: 10.1085/jgp.201010488 ...

Pacemaker cells in the sinoatrial node control heart rate, but what controls the ticking of these pacemaker cells? New research reveals, for the first time, a critical functional interaction ...

Conversely, when a change to a standing position is made, ... NE norepinephrine, and SAN sinoatrial node. Arterial baroreceptors in the carotid sinuses and aortic arch sense pressure changes, ...

When this is a problem, an operation is often performed to install an artificial pacemaker, which takes over the role of the sinoatrial node. Heart rate Without nervous system control, your heart ...

A junctional rhythm occurs when the electrical activation of the heart originates near or within the atrioventricular node, rather than from the sinoatrial node. Because the normal ventricular ...

Abnormally slow heart rates result from breakdowns in two principal areas of the heart. First, the sinoatrial, or SA, node sets your “resting” heart rate, usually somewhere between 60 and 100 beats ...