2007-04-12 04:22:07 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
The natural pace marker of the heart in known as tha Sino-Atrial Node or SA node. It is connected to the Atrio-Ventricular node or AV-node, in a normal heart the AV-node pauses the signal from the SA-node to allow the blood flow from the atria to the ventricle to "catch up" to the electrical signal. The AV-node, in the absence of the SA-node's signal, can function as a back-up pacemaker.
2007-04-12 08:32:44 · answer #1 · answered by tickdhero 4 · 0⤊ 0⤋
The electrical impulse starts in the atria and then proceeds through a junction before it reaches the ventricle
2007-04-12 04:34:08 · answer #2 · answered by John D 4 · 0⤊ 0⤋
The electrical pulse.
A steady current would put the heart into fibrillation. A pulsed current keeps the rhythm.
You want the blood to have time to move from one chamber to the next.
2007-04-12 04:25:01 · answer #3 · answered by Stuart 7 · 0⤊ 0⤋