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.
You may be experiencing paroxysmal atrial fibrillation. Atrial fibrillation (AF or AFib) occurs when the atria (upper chambers of the heart) lose their normal rhythm and beat chaotically. When this happens, blood isnât flowing through the heart and body efficiently. This inefficient flow can cause blood to pool inside the atria, increasing the risk of blood clots.