His institution of this sacrament repeats in each holy mass, when is called forth the moment of the last supper, when he took the bread, the wine and changed in his flesh and blood (in unable to see manner). He said "Do this for my commemoration".
This depends greatly on the belief structure which you are making reference to. For example, Protestant and Catholic denominations will have differing opinions to the details.
Some groups feel it is a metaphor, others that it is literal, and still others that it simply makes reference to God being part of all things.
In the true literal sense of transubstantiation, however, the answer is simply no. Though church based groups have claimed to have tested and shown the presence of blood/tissue following the ritual, it has never been demonstrated under scientific conditions.
For a more detailed and in depth explanation of the differing viewpoints in differing traditions, please see the full Wikipedia page on Transubstantiation;
This is a Roman Catholic question as the word 'Eucharist', and 'mass' also belongs to the Catholic Church, as protestants seldom use it.
Religion
The light or candle over the tabernacle tells you Jesus is present. At mass, Jesus is present in the Eucharist; also in the scripture readings.
Jesus is present in the WORD (readings and Gospel).Jesus is present in the PEOPLE.Jesus is substantially present in the EUCHARIST (Body and Blood).
The Most Holy Eucharist is Our Blessed Lord, Jesus Christ, appearing under the appearances of Bread and Wine. It is really and truly 100% Jesus in His Divinity and His Humanity, Body and Blood, fully present in each separately and individually just as much as He was present on the Cross 2,000 years ago to His Blessed Mother, and the soldiers.
Jesus' body and blood in the form of bread and wine at Eucharist
Eucharist/Holy Communion
The Eucharist is important to Catholics because Christ is important to Catholics. You see, the Catholic Church teaches the doctrine of the real Presence, which means that Catholics believe that the host is not a mere symbol of the Body of Christ, and the wine of the blood. They are really and truly the body, blood, soul and divinity of Jesus Christ sacramentally present under the appearance of bread and wine.
The church says that the Eucharist is the body of Jesus, so in essence, the Eucharist is holy
Jesus first celebrated the Eucharist at the Last Supper on Holy Thursday in anticipation of His sacrifice on the cross.
Because the Eucharist is Jesus, and that is what Mass is all about.
Jesus is present under the appearance's of bread and wine. Jesus knew it would be hard for us to eat actual human flesh drink human blood. here is some information about the Eucharist and how Jesus is truly present (see below).Catholic AnswerThe Eucharist is Jesus: Body and Blood, Soul and Divinity, through a miracle called transubstantiation. In other words, when Jesus pronounced the words, "This IS my Body" over the bread at the Last Supper, the entire substance of the bread ceased to exist, and the entire substance of Jesus' Body now exists there under the "accidents" (philosophy word to mean appearance) of the bread. Re-read the sixth chapter of St. John's Gospel closely, the entire thing, notice that it starts with Jesus feeding the five thousand, this is a "figure" of the Eucharist, then He walks on water to prove to His disciples that He is master over the elements, then He starts the discourse on the Eucharist, including answering the objections - over and over again - of the disbelieving Jews..When it comes right down to it, we really truly do not understand the "HOW", all we really know is that Jesus is God, and that He told us that this is His Body, and so if we are real Christians, we believe what He told us; and the Church has taught and believed this from the very beginning.
First of all, there are no "Roman Catholics", it's just Catholic. Secondly, the Eucharist is the actual Body and Blood of Our Blessed Lord, Jesus Christ, which He left us as an everlasting memorial of His Sacrifice of Himself upon the cross for our redemption. Thus its significance is immense, it is really and actually, God incarnate in a piece of bread for our salvation.