This verse is rich with spiritual and scientific truth. William Harvey, a scientist (and creationist), discovered in 1620 that biological life is maintained by the blood circulating through the body to bring nourishment and carry away waste.
As is typical and always proven to be the case, science follows God's Word, which is the true and ultimate authority on all of creation. Naturally.
The spiritual truth is at the heart of our relationships to God. In ages past animal blood sacrifices were offered to atone for a person's sin; it was an offering of life itself as a substitution for the life of the sinner who deserved to die. Human sacrifices were prohibited by God. It would have served no purpose, anyway, since any human's blood would have been contaminated by sin, too. Thus, God required the blood of a "clean animal." Animals, of course, cannot sin, not being made in the image of God and having no moral reasoning. The animal did not take away the sin, but served as a temporary 'covering' and had to be repeated regularly, according to God's law.
There was only one permanent solution to the sin problem, and it was for Jesus Christ to be manifest on earth. It required the sinless blood of the "Lamb of God, which taketh away the sin" (John 1:29). "Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us." Hebrews 9:12. His life was in His blood, and He came to earth for the specific purpose of shedding that blood to atone for the sins of all who would believe on Him.
He has "made peace through the blood of the cross" (Colossians 1:20.) The only peace on this earth comes through the sacrifice of Jesus Christ.