[Arthur McGowan]

You are incorrect, in part. The bread becomes the Body of Christ; the wine becomes His Blood. The bread does not become the Blood, and the wine does not become the Body.

However, the Body and Blood are both present under both species because Christ is now alive, and his Blood is flowing in His Body. Had the Eucharist been celebrated while Christ was dead in the tomb, the Blood would NOT have been present in the host, and the Body would NOT have been present in the chalice.

[A.A. Cunningham]

Read the Council of Constance.