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
Experiments in the Revival of Organisms is shown being isolated from a body; four tubes connected are then connected to the organ. Using an apparatus, the heart beats in the same manner as if it were in a living organism. The film then shows a lung in a tray, which is operated by bellows that oxygenate the blood. Following the lung scene, the audience is then shown a heart-lung machine, composed of a pair of diaphragm linear pumps, venous and arterial, exchanging oxygen with a water reservoir. It is then seen supplying a canine head with oxygenated blood. The head is presented with external stimuli, which