which part of human heartis considerd as pace maker why is it so called?

Answer 1

The Sinoatrial (SA) node.

The SA node basically dictates the rate at which the heart beats and therefore is considered the pacemaker.
Of course the rate of discharge of SA node can be influenced by the autonomic nervous system.

Diseases that result in poor functioning of the SA node have to have artificial pacemakers inserted into the heart, to help maintain a normal heart rate.

Answer 2

Let me divide the answer into two parts..

[1] What is a natural pacemaker?

The heart's "natural" pacemaker is called the sinoatrial (SA) node or sinus node. It's a small mass of specialized cells in the top of the heart's right atrium (upper chamber). It makes the electrical impulses that cause your heart to beat.

A chamber of the heart contracts when an electrical impulse moves across it. For the heart to beat properly, the signal must travel down a specific path to reach the ventricles, the heart's lower (pumping) chambers.

The natural pacemaker may be defective, causing the heartbeat to be too fast, too slow or irregular. The heart's electrical pathways also may be blocked.

What's an artificial pacemaker?

An "artificial pacemaker" is a small, battery-operated device that helps the heart beat in a regular rhythm. Some are permanent (internal) and some are temporary (external). They can replace a defective natural pacemaker or blocked pathway.

* A pacemaker uses batteries to send electrical impulses to the heart to help it pump properly. An electrode is placed next to the heart wall and small electrical charges travel through the wire to the heart.

* Most pacemakers are demand pacemakers. They have a sensing device. It turns the signal off when the heartbeat is above a certain level. It turns the signal back on when the heartbeat is too slow.

Answer 3

Electrical signals come to the heart to start the orderly contraction of the heart cycle. The sinoatrial (SA) node, is the heart's natural pacemaker. Signals from the SA node cause the rhythmic, orderly process of ventricular contraction and repolarization, followed by atrial contraction and repolarization.

Answer 4

the Sinu Atrial Node or SAN is known as the Pacemaker of the Heart. This SAN is a bundle of specialised muscle fibres that provide the impulse for heartbeat... SAN is located in the Right Auricle of our heart.

Answer 5

The sinoatrial node, and it's called that because it sends the electric signal in the heart which sets the pace, or rhythm of its beating.

Answer 6

I don't think there is part of the heart that is the "pacemaker". Heart rhythm (pacemaker) comes from the Vagal nerve which is connected to the brain stem.