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The diastolic pressure reflects

  1. The amount of force when the heart is at rest

  2. The amount of force when the heart contracts

  3. The amount of force during exercise

  4. The amount of force during relaxation

The correct answer is: The amount of force when the heart is at rest

The diastolic pressure reflects the amount of force on the arterial walls when the heart is at rest between heartbeats. Therefore, options B and D are incorrect because they refer to the amount of force during contraction or relaxation of the heart, not during rest. Option C is also incorrect because exercise would increase the force on the arterial walls, leading to an increase in both systolic and diastolic pressure. The diastolic pressure is specifically related to the force during rest, which is why option A is the correct answer.