Blood air to all of the cells of the body, and venous blood carries carbon dioxide, a waste product of metabolism by cells, to the lungs to be exhaled. However, one exception includes pulmonary arteries, which contain the most deoxygenated blood in the body, while the pulmonary veins contain oxygenated blood. Additional return flow may be generated by the movement of skeletal muscles, which can compress veins and push blood through the valves in veins toward the right atrium. The blood circulation was famously described by William Harvey in 1628. In vertebrates, the various cells of blood are made in the
The Sacrament of the Body and Blood of Christ—Against the Fanatics both sides became more firmly entrenched into their positions. The Sacrament of the Body and Blood of Christ—Against the Fanatics The Sacrament of the Body and Blood of Christ—Against the Fanatics is a book by Martin Luther, published in late September or early October 1526 to aid Germans confused by the spread of new ideas from the Sacramentarians. At issue was whether Christ's true body and blood were present in the Lord's Supper, a doctrine that came to be known as the sacramental union. The of Christ's true body and blood in the Lord's Supper was a controversial issue at