A 55-year-old man develops a severe case of atrial fibrillation due to age-related changes in the heart. Which mechanism is primarily responsible for this condition?
Q1. A 55-year-old man develops a severe case of atrial fibrillation due to age-related changes in the heart. Which mechanism is primarily responsible for this condition?
Answer: Decreased parasympathetic tone
Explanation: Atrial fibrillation is primarily caused by decreased parasympathetic tone, leading to abnormal heart rhythms.