Jesus’ Body is sacramentally present when the bread is transubstantiated into his Body. His Blood is sacramentally present when the wine is transubstantiated into his Blood. This is His “sacramental presence”. And since he is alive, wherever his Body and Blood are, there is his Soul. This is the concomitant presence of His Soul. And where his Body, Blood and Soul are, there is his Divinity, also concomitantly present.
You can read about this in St. Thomas Aquinas’ Summa Theologica here:
ccel.org/ccel/aquinas/summa.TP_Q76_A1.html
Also, note that where the Body of Christ is, since he is living, by concomitance His Blood is also present. and where the Blood of Christ is, his Body is also present by concomitance, all because He is the living Christ. You cannot have a “part” of Christ, but only the complete Christ, as Thomas explains here:
ccel.org/ccel/aquinas/summa.TP_Q76_A2.html
So, when Catholics eat His Body, they are also receiving his Blood, Soul, Divinity. And when they drink His Blood, they are also receiving his Body, Soul, Divinity.
And they have life in them, because they are feeding on His Flesh and drinking His Blood.
But all this was known from the time of the apostles, from Jesus himself. Thomas, Trent, and Faustina were only elaborating on what was true and known from the beginning.