Quotes from Angelus Press

The commingling of the Sacred Body and Blood symbolically expresses that in reality on the alter the Body and Blood are not separate, but under each species the whole Christ is present as one sacrificial gift and one sacrificial food. It tells us also of the Resurrection, in which His Body and Blood were again united and vivified; the Lamb that was slain now lives eternally.

The Host and the Chalice upon the alter plead before God on our behalf just as our Lord sacrificed on the Cross pleaded for us on Good Friday because it is identically the same sacrifice which is renewed on our alters in an unbloody manner.