sinoatrial node
sinuatrial node
SA node

Damage to the sinoatrial node can result in a slower heart rate.

The cardiac pacemaker cells of the sinoatrial node in the heart provide a good example.

These cells form an ovoid called sinoatrial node, on the left venous valve.

Because the sinoatrial node is responsible for the rest of the heart's electrical activity, it is sometimes called the primary pacemaker.

This cluster is called the sinoatrial node, or SA node.

It causes tachycardia by blocking vagal effects on the sinoatrial node.

When this is a problem, an operation is often performed to install an artificial pacemaker, which takes over the role of the sinoatrial node.

If a pacemaker other than the sinoatrial node is pacing the heart, this condition is known as an escape rhythm.

The electrical origin of atrial Purkinje fibers arrives from the sinoatrial node.

The right vagus innervates the sinoatrial node.

Since the premature beat initiates outside the sinoatrial node, the associated P wave appears different from those seen in normal sinus rhythm.

A specialized portion of the heart, called the sinoatrial node, is responsible for atrial propagation of this potential.

The electrical activity of sinus rhythm originates in the sinoatrial node and depolarizes the atria.

Systole of the heart is initiated by the electrically excitable cells of the sinoatrial node.

A wave of excitation spreads out from the sinoatrial node through the atria along specialized conduction channels.

Under normal conditions, the heart's sinoatrial node determines the rate by which the organ beats - in other words, it is the heart's "pacemaker."

When the heart's sinoatrial node is defective, the heart's rhythms become abnormal - either too fast, too slow, or a combination.

Increase heart rate in sinoatrial node (SA node) (chronotropic effect).

Normally, the heart rate is controlled by a cluster of cells called the sinoatrial node (SA node).

Its negative chronotropic effect results in a modest lowering of heart rate, due to slowing of the sinoatrial node.

Cells in the sinoatrial node, located in the right atrium of the heart, spontaneously depolarize approximately 100 times per minute.

So, your heart has a tiny group of cells known as the sinoatrial node that is responsible for coordinating heart beat rate across your heart.

Pacemaker potentials are fired by sinoatrial node (SAN), but also by the other foci.

The sinoatrial node (SAN) is located within this chamber next to the vena cava.

These T-type calcium channels are also found in pacemaker cells, the sinoatrial node and the atrioventricular node.

The sinoatrial node (also commonly spelled sinuatrial node, abbreviated SA node or SAN, also called the sinus node) is the impulse-generating (pacemaker) tissue located in the right atrium of the heart, and thus the generator of normal sinus rhythm.

The SA node is considered the pacemaker of the heart.

SA node dysfunction, (1st degree block) which can cause the rate of impulse to slow.

SA node blockage so that impulses never leave the atria.

The SA node is a group of cells that generates electrical current.

Whenever the SA node sends out a charge, your heart beats.

The natural pacemaker (the SA node) loses some of its cells.

However, the other firing frequencies are slower than the one of the SA node (as seen above).

Thus, in the normal, healthy heart, only the SA node intrinsic rate is observable.

In contrast, the SA node in normal state can fire at 60-100 beats per minute.

The SA node generates electrical impulses, much like those produced by nerve cells.

When the SA node "fires," it triggers the following process:

The SA node (called the pacemaker of the heart) sends out an electrical impulse.

Although they make up a relatively small portion of the heart SA node cells play a crucial role in the heart's function.

Electrical activity that originates from the SA node is propagated to the rest of the heart.

Location of the pacemaker can also change its effect on the SA node and its rhythm.

In addition to the above blocks, the SA node can be suppressed by any other arrhythmia that reaches it.

They can also lead to cessation of the SA node and more serious dysrhythmias.

Two sets of nerves do the job: the first speeds up the SA node, and the second slows the pacemaker.

The signal leaves the SA node and travels through the two upper chambers (atria).

The SA node sends another signal to the atria to contract, which starts the cycle over again.

These converted SA node cells are able to respond to the nervous system, allowing the heart to be regulated as normal.

This cluster is called the sinoatrial node, or SA node.

At rest, the SA node normally sends 60 to 100 impulses per minute (the normal sinus rhythm).

An artificial pacemaker mimics the electrical impulses normally created by the SA node.

Under normal conditions, electrical activity is spontaneously generated by the SA node, the physiological pacemaker.