17779158
Beschreibung
Karteikarten von Sam Gunnell, aktualisiert more than 1 year ago
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Erstellt von Sam Gunnell
vor mehr als 5 Jahre
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| Frage | Antworten |
| The cardiac muscle automatically contracts and relaxes without nerve stimulation, so it is described as...? | Myogenic |
| What initiates the cardiac cycle? | Sino-atrial node (SAN) |
| Where is the SAN located? | Walls of right atrium |
| What prevents the electrical wave passing to the ventricles as well the atria? | A band of collagen fibres between the aorta and ventricles |
| How does the electrical impulse get to the ventricles? | Through the AVN but it delays the wave so that blood can get into the ventricles before they contract |
| What is the pathway of the electrical impulse? | SAN AVN Purkyne fibres Bundle of his |
| What do the purkyne fibres do? | Conducts electrical impulses up and outwards through the ventricle walls |
| What factors can effect heart rate? | Age Fitness level Medical conditions Diet |
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