The heart rate is determined by the natural pacemaker of the heart, SA node, which initiates impulses that travel throughout the heart. It is able to generate impulses independently of the central nervous system. However, the CNS does play a role in regulating the activity of the SA node. ...
Your heartbeat is triggered by electrical impulses that travel down a special pathway through your heart. The impulse starts in a small bundle of specialized cells called the SA node (sinoatrial node), located in the right atrium. This node is known as the heart's natural pacemaker. The elec...
Sinoatrial Node (SA Node) The Natural Pacemaker Thesinoatrial node, orSA node, is known as the natural pacemaker of the heart. It regulates the rhythm of the heart beat by generating an impulse that causes the heart muscle to contract. The faster these impulses are generated, the faster the ...
Your heartbeat is triggered by electrical impulses that travel down a special pathway through your heart. The impulse starts in a small bundle of specialized cells called the SA node (sinoatrial node), in the right atrium. This node is known as the heart's naturalpacemaker. The electrical act...
SA node of the rabbit, but that it also augments the outward current which would tend to decelerate pacemaker depolarisation. We find that an additional current,if, is activated within the range of voltage where the pacemaker depolarisation occurs: this could be important both in normal pace...
The SA node responds to the body's overall need for blood and increases the heart rate when necessary, such as during exercise, emotional excitement, or illness such as fever. The SA node is sometimes called the “natural pacemaker” of the heart. ...
Node Signals The sinoatrial (SA) nodes are areas of the heart's atrium that act as the heart's pacemaker. Impulses from the SA node cause the heart’s chambers to contract. Purkinje fibers receive their impulses from the SA node and move the impulse through the heart’s muscles. Just bel...
The sinoatrial node (SA node) is the natural pacemaker of the heart, and it generates electrical impulses that cause the heart to beat. The electrical impulses travel through the atria and reach the atrioventricular node (AV node), which delays the impulses before they reach the ventricles. ...
A fundamental principle of contraction of the heart is the spontaneous generation of an electrical impulse, which occurs because of rapid changes in the permeability of the pacemaker cells. This electrical impulse is generated from pacemaker’s cells, found in the SA node that is responsible for ...
Synchronization was demonstrated for the SA node as well as for a lower pacemaker, presumably the AV node. The possible role which this type of synchronization may play in spontaneous impulse formation in pacemaker tissue is discussed. 展开 关键词:...