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 include:Heart palpitations.Irregular pulse.Shortness of breath, especially during physical activity or emotional stress.Weakness, fatigue.Dizziness, confusion.Lightheadedness or fainting (syncope).Chest pain (angina).Atrial fibrillation is often discovered during routine medical checkups, because many people do not have symptoms.