vascular reflex

例句：

1. 1. This condition is characterized by a vascular reflex in the brain that causes sudden changes in heart rate and blood pressure.
   这种状况的特点是大脑中的血管反射，导致心率和血压突然改变。
2. 2. The vascular reflex can be triggered by a variety of stimuli, including temperature changes and physical activity.
   血管反射可以被多种刺激触发，包括温度变化和物理活动。
3. 3. During exercise, the vascular reflex helps to constrict blood vessels, increasing blood flow to muscles and preventing muscle cramps.
   在运动期间，血管反射有助于收缩血管，增加肌肉血流，防止肌肉抽筋。