In the open circulatory system of insects, blood is returned to the ventral tubular hearts through:

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In insects with an open circulatory system, blood (or hemolymph) is returned to the heart through a mechanism involving suction created by the movement of hemolymph from the posterior part of the body towards the anterior part. This movement is facilitated by the body's natural movements and the structure of the circulatory system, rather than through vessels specifically designed for feeding back into the heart or the direct action of body or locomotion muscles.

In the Open Circulatory System of Insects, Blood Is Returned