The blood circulatory system of the human body is distributed via 2 main systems -
Arteries and Veins
1. Arteries which transport oxygenated blood from the heart to various parts of the body.
2. Veins which transport blood towards the heart for purification.
Blood having travelled around your body and now oxygen poor, enters the Right Atrium of the heart and then leaves via the Pulmonary Artery to the lungs where it becomes oxygenated before entering the Left Atrium ready to be pumped around the body for the journey to be repeated.
Arteries carry oxygenated blood (with the exception of the pulmonary artery and umbilical artery).
Veins carry deoxygenated blood (with the exception of pulmonary veins and umbilical vein).
Superficial veins, deep veins, pulmonary veins and systemic veins