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Repost from امتحانات وكوزّات اعداد طب (دفعة 2003)
When the impulse reaches another special area of the heart , right in the center of the septum konwas Atrio-Ventricular (or AV) Node
The impulse is delayed for approximately 0.2Anonymous voting
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Specialized cells in the right atrium called the sino-Atrial Node (SAN)Anonymous voting
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The AV Node relays the electrical impulse down the septum along the Bundle of Hiss to the base of the ventriclesAnonymous voting
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The vagus nerve of the parasympathetic nervous system decreases heart rateAnonymous voting
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Accelerator of the sympathatic nervous system increase heart rateAnonymous voting
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Heart is unlike other muscles ,it doesn't rquire anew nerve impulse for each contractionAnonymous voting
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During exercise that can increase to as many as 200 beats per minute for athleteAnonymous voting
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