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🤍 Medical Student

🤍 Medical Student

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- فانيه .

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كملنا ... الحمدلله الذي هدانا وماكنا لنهتدي لولا أن هدانا الله

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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 0.2
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(SAN) this is the heart's natural pace maker
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Specialized cells in the right atrium called the sino-Atrial Node (SAN)
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The AV Node relays the electrical impulse down the septum along the Bundle of Hiss to the base of the ventricles
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The vagus nerve of the parasympathetic nervous system decreases heart rate
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Accelerator of the sympathatic nervous system increase heart rate
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The autonomic nervous system controls heart rate
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Heart is unlike other muscles ,it doesn't rquire anew nerve impulse for each contraction
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During exercise that can increase to as many as 200 beats per minute for athlete
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For rest of us 150 b.p.m.is about all wecan safely manage
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Cardiac muscle can respire anaerobically and so the muscle cannot get tired
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The heart can be thought as three pumps sitting side by side
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Our heart beats over 2.5 million times in an average life span
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The heart can not generate its own electrical rhythm myogenic
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السؤال تبيله حد مركز 😂😶
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Septum Prevents the mixing of oxygenated (right side) and deoxygenated (left side) blood
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The cardiac cycle is the sequence of events in many heartbeats
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If any of the valves do not close properly An extra sound called a heart murmur 🤣😂 My be heard
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Sound that caused by the snapping shut of the Aortic Pulmonary
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