1.What is this Sacrament called?
The word EUCHARIST comes from the Greek noun εὐχαριστία (eucharistia), meaning thanksgiving. In the New Testament of the Bible we find Jesus establishing the Eucharist. At Holy Mass (Church Service) Catholics receive Jesus under the appearance of bread from the Priest; this is the Body and Blood of Christ. We believe that this transubstantiation happens because Jesus expained it in the Bible.
Bible basis: Now as they were eating, Jesus took bread, and after blessing it broke it and gave it to the disciples, and said, “Take, eat; this is my body. (Matt. 26:26)
CCC 1328 The inexhaustible richness of this sacrament is expressed in the different names we give it. Each name evokes certain aspects of it. It is called: Eucharist, because it is an action of thanksgiving to God. The Greek words eucharistein and eulogein recall the Jewish blessings that proclaim - especially during a meal - God's works: creation, redemption, and sanctification.
CCC1330 We speak of the Most Blessed Sacrament because it is the Sacrament of sacraments. The Eucharistic species reserved in the tabernacle are designated by this same name.
Jesus said to them, “Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you. Whoever eats my flesh and drinks my blood has eternal life, and I will raise him on the last day. For my flesh is true food, and my blood is true drink. Whoever eats my flesh and drinks my blood remains in me and I in him.(John 6:53-56)
3. Why is it called Holy Communion?
The term "Communion" comes from Latin communio ("sharing in common"), translated from the Greek κοινωνία (koinōnía) coming from the New Testament:
4.What is the Breaking of Bread?
The phrase (Greek: του κλασαι αρτον) is found in the New Testament
The disciples of Jesus recounted what had taken place along the way, and how they had come to recognize him in the breaking of bread. (Luke 24:35)
They devoted themselves to the teaching of the apostles and to the communal life
Every day they devoted themselves to meeting together in the temple area and to breaking bread in their homes. (Acts 2:42)
5. Why is it called the Holy Mass?
Then he took the bread, said the blessing, broke it, and gave it to them, saying, “This is my body, which will be given for you; do this in memory of me.” (Luke 22:19)
CCC 1332 Holy Mass (Missa), because the liturgy in which the mystery of salvation is accomplished concludes with the sending forth (missio) of the faithful, so that they may fulfill God's will in their daily lives.
CCC means Catechism of the Catholic Church