CMcLaurin:
My question is thus; Why is the Bread referred to as the Body, and the Wine the Blood-- if the Body, Blood, Soul, and Divinity are present in both?
Both are fully and completly present in each species.
Christ is Alive, that means His Body and Blood are united, the Body without the Blood is dead, the Blood without the Body is dead. Since Christ IS Alive, then two must therefore be united.
In fact, it is 100% theologically proper for the priest to hold up the Host and say “Blood of Christ” and the deacon to hold up the cup and say “Body of Christ”
The GIRM specifies otherwise so it would be a sin of disobedience to do so, but theologically correct anyway.
We use the terminology for two reasons.
The first is because the Church desires to use the same words as Christ “This is my Body” for the Consecrated Bread and “This is my Blood” for the Consecrated wine.
The second is in deference to our human understanding. We associate Body with being solid and Blood with being a liquid. Both of these are external properties, known as ‘Accidents’. The accidents do not change, but the underlying ‘substance’ does.
The Substance in each case becomes the exact same thing, our Complete Body, Blood, Soul and Divinty of our Risen Lord.
It’s easier for our minds to grasp a very difficult mystery using specific terms for each species of the Eucharist, so God, through His Church encourages us to do so.