Final answer:
During moderate-intensity exercise, diastolic blood pressure generally remains stable or may slightly decrease due to the physiological mechanisms involved.
Step-by-step explanation:
During moderate-intensity exercise, diastolic blood pressure generally remains relatively stable or may decrease slightly. This is due to the physiological mechanisms involved in exercise. When we exercise, our heart rate increases, leading to an increase in cardiac output, which is the amount of blood pumped by the heart per minute. As a result, more blood can be delivered to the working muscles. Additionally, the blood vessels in the muscles dilate, allowing for increased blood flow and oxygen delivery. These changes help to improve the efficiency of oxygen and nutrient delivery to the muscles during exercise.