This is the self-depolarising set of myocardial (heart) cells that do not really have a contractile function but serve to trigger the coordinated electrical wave of depolarisation that causes the muscle to squeeze and pump blood.
The SA node controls the heart rate by generating electrical impulses. The SA node itself is controlled by the autonomic nervous system, which also controls the blood pressure and breathing.
sinus node
The sinoatrial, or SA, node is known as the pacemaker of the heart. There are other potential pacemakers if the SA node fails, but it is the main pacemaker.
The SA node is the "pacemaker" of the heart. Cells in the SA node are called "pacemaker" cells and they direct the contraction rate of the entire heart by generating action potentials.
The primary pacemaker of a normal healthy heart is the sinus node (or SA node). It is located in the right atria of the heart.
The primary pacemaker of the mammalian heart is the sino-atrial node. If the SA node fails, the atrioventricular node (AV node) takes over pacemaking.
The heart's "pacemaker" is the SA (sinoatrial) node.
SA node (Sinus Node)
The SA Node.
The SA node normally functions as the pacemaker for the entire heart because its intrinsic rate is the fastest in the system. From the SA node, impulses spread out over the atria, causing them to contract.
No, the purkinje fiber is not the natural pacemaker. The sinoatrial node (SA node) is the natural pacemaker of the heart.
SA node (Sinus Node)
sinoatrial node (SA)
yes