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频道帖子
| 2 | 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 | 72 |
| 3 | (SAN) this is the heart's natural pace maker | 277 |
| 4 | Specialized cells in the right atrium called the sino-Atrial Node (SAN) | 250 |
| 5 | The AV Node relays the electrical impulse down the septum along the Bundle of Hiss to the base of the ventricles | 212 |
| 6 | The vagus nerve of the parasympathetic nervous system decreases heart rate | 182 |
| 7 | Accelerator of the sympathatic nervous system increase heart rate | 59 |
| 8 | The autonomic nervous system controls heart rate | 171 |
| 9 | Heart is unlike other muscles ,it doesn't rquire anew nerve impulse for each contraction | 157 |
| 10 | During exercise that can increase to as many as 200 beats per minute for athlete | 151 |
| 11 | For rest of us 150 b.p.m.is about all wecan safely manage | 151 |
| 12 | Cardiac muscle can respire anaerobically and so the muscle cannot get tired | 149 |
| 13 | The heart can be thought as three pumps sitting side by side | 155 |
| 14 | Our heart beats over 2.5 million times in an average life span | 157 |
| 15 | The heart can not generate its own electrical rhythm myogenic | 156 |
| 16 | السؤال تبيله حد مركز 😂😶 | 53 |
| 17 | Septum
Prevents the mixing of oxygenated (right side) and deoxygenated (left side) blood | 159 |
| 18 | The cardiac cycle is the sequence of events in many heartbeats | 163 |
| 19 | If any of the valves do not close properly
An extra sound called a heart murmur 🤣😂
My be heard | 160 |
| 20 | Sound that caused by the snapping shut of the Aortic Pulmonary | 158 |
