Heart cell reversing beat direction
Référence de la vidéo 11936724
| Fluorescence microscope footage of an adult heart cell reversing its beat direction. The white pulse shows the wave of calcium ions that controls the contraction of the muscle, and hence the heartbeat. In an intact heart, the signal propagates outwards over the entire heart muscle in such a way that the rhythmic heartbeat is maintained. To stimulate this individual cell, it was treated with isoprenaline, a beta-adrenergic agonist drug used to treat a slow heart rate (bradycardia). The spontaneous reversal of the calcium wave was unexpected, however. If such an event can occur in vitro, it may occur in a live heart, where it could be a cause of arrhythmia. This heart cell was tagged with the fluorescent dye fluo-3, which reveals calcium ions in cells. | |
| Licence : | Droits gérés |
| Crédit : | Science Photo Library / The University of Texas Health Science Center At Houston |
| Model Release : | Non requis |
| Durée : | 49 Secondes |
| Aspect ratio : | 4/3 |
| Restrictions : | - |
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Mots-clés
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