When the blood is pumped away from the hear it travels to the body through the aorta arteries aterioles and capillarys. Here the oxygen in the blood is used up. The blood, which now has no oxygen, flows to the lungs where it get oxygenated and back through to the heart using the pulmonary vein
Storage failure Another type of forgetting involves a situation where the information is stored, but decays . This idea suggests that memory traces fade if they are unused.