50
The intrinsic rate of the AV node, also known as the inherent pacemaker rate, is the rate at which the AV node generates electrical impulses when not influenced by outside factors. It is typically around 40-60 beats per minute and serves as a backup pacemaker if the SA node fails to function properly. The AV node's intrinsic rate helps to regulate the heart rate and maintain cardiac function.
SA node, AV node, Bundle of His, Purkinje fibers
It is a built-in rate at which it initiates electical impulses, meaning that the AV node has a rate range at which it usually produces impulses.
sure of coarse it can ................ !
Its one of these, cant remember which one though: AV node, SA node AV bundle, Purkinje fibres. SA node, AV bundle, Purkinje fibres, AV node. SA node, AV node, AV bundle, Purkinje fibres. Purkinje fibres, SA node, AV node, AV bundle.
fewer than 40 bpm
what are the causes of av node malfunction
The rate of P waves will be faster than the rate of QRS complexes.
Only if the SA Node isn't firing or there is some form of heart block. IIRC, under typical conditions, the SA node fires at 60-70 bpm. If that doesn't happen, or the electrical pathway between the two nodes is broken, the AV node will automatically fire at 50-60 bpm. If that doesn't happen, the ventricles themselves will fire at ~40 bpm. The logic of this system is that each of these nodes will fire on their own, so it is difficult to completely paralyze the heart. At 60 bpm the SA node sends one signal per second, at 50 bpm the AV node waits 1.2 seconds before automatically firing, and at 40 bpm the ventricles wait 1.5 seconds. Because the SA node is fastest, it is usually what paces the rest of the heart. In other words, the AV is a backup pacemaker (among other things).
av node
No, the sinoatrial (SA) node initiates contraction of the atria, which subsequently causes stimulation of the AV node, which then initiates contraction of the ventricles via the Purkinje fibers.
1) Sino-atrial node is master node and atrio-ventricular node is on the path from SA node to impulse to ventricles. 2) SA node has intrinsic rhythme rate of about 72 beats/ minute and AV has intrinsic rhythme rate of about 50 beats per minute. 3) SA node has autonomic ( sympathetic and parasympathetic ) nerve supply and AV node do not have any such supply. 4) SA node regulates the heart rate and AV node slows down the conduction across the path, so that atria gets time to contract, to be fallowed by contraction of ventricles. 5) Disease of the SA node generally leads to sick sinus syndrome. Disease of the AV node generally leads to atrioventricular block.