There is a constant flow of blood through the capillaries even though the heart is forcing blood out into the arterial system only part of the time.

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Quizplus · Accepted Answer

This is true. The capillary beds are constantly perfused with blood even when the heart is not actively pumping into the arterial system. This is due to the continuous flow of blood from arterioles into the capillary beds and then out into venules, facilitated by the pressure gradient and the action of precapillary sphincters.

There Is a Constant Flow of Blood Through the Capillaries