â¢ One plate is pushed beneath the other, or equivalent description. â¢ A trench may be formed at the subduction zone. (ii) Explain how subduction leads to volcanic activity. (2 points: 1 point for a correct explanation of one plate being pushed down and melted and 1. point for a correct explanation of molten material /magma rising to the surface near the zone)
The symptoms are generally the same; however the duration of the AFib and underlying reasons for the condition help medical practitioners classify the type of AFib problems. The most common symptom: a quivering or fluttering heartbeat Atrial fibrillation (AFib) is the most common type of irregular heartbeat. The abnormal firing of electrical impulses causes the atria (the top chambers in the heart) to quiver (or fibrillate). View an animation of atrial fibrillation.
All of these can be symptoms of paroxysmal atrial fibrillation. Atrial fibrillation (AF or AFib) happens when the atria (upper chambers of the heart) lose their regular rhythm and beat chaotically. When this happens, blood isnât really streaming through the heart and body efficiently. This inefficient flow can cause blood to pool inside the atria, increasing the risk of blood clots.