In the heart the blood is made up of white blood cells, platelets, plasma and red blood cells. They all work together to circulate your body to do specific jobs while using the same route. For example, the red blood cell's job is to travel oxygen through the body. It starts from the aorta and aortic valve and travels to the capillaries.
Then, the blood travels to the heart through either the Superior Vena Cava or Inferior Vena Cava. After that it flows to the right atrium which contracts and pushes to the tricuspid valve. This goes to the right ventricle.
Blood goes through the mitral valve into the left ventricle.
left atrium, , pulmonary artery and valve
It travels up the pulmonary semilunary valves and out the pulmonary artery. It leads the blood to the lungs. It moves to the right or left pulmonary artery to reach the lung. When oxygen is received the carbon dioxide is disposed, it returns to the heart through the pulmonary veins.
In order to be hydrated the blood travels all around the body. Oxygen is delivered to the body and certain organs and muscles. As well as collecting de-oxygenated blood.
The blood is released into the aorta. The red blood cells are through out your entire body and the cycle starts all over again.