A normal human heart beats 70 to 80 times in 1 minute which means 1,00,000 times a day. The heart has 4 chambers- two upper chambers and two lower chambers known as Atria and Ventricles respectively. The right atrium of the heart gets de-oxygenated blood flow which in turn flows through the pulmonary valve into the pulmonary artery into the lungs. The de-oxygenated blood gets purified in the lungs and flows back through the same route to the rest of the body. The blood vessels which fed the heart are known as coronary arteries.