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)
Symptoms of atrial fibrillation occur when the upper chambers of the heart (atria) beat in a disorganized fashion. Atrial fibrillation is a type of arrhythmia. Characteristic symptoms include shortness of breath, palpitations, and lightheadedness.
Symptoms of atrial fibrillation, also called afib, can be debilitating. They may include palpitations, shortness of breath, fatigue, and weakness. But trying to reduce these symptoms through drugs that control the abnormal heart beat, called anti-arrhythmic drugs, can come with serious side effects.