How blood flows in our heart and body?
There are 2 different circuits. The large one involves the left ventricle pumping blood through arteries to capillaries throughout the body, supplying cells with O2 and retrieving Co2 in veins, which gather in the right atrium. From there it is pumped into the right ventricle through a valve, which is the sound you hear when listening to a heart. Then the small circulation begins, arteries from the right ventricle taking blood to the lungs, which then supply it with O2, and the veins then take the O2-rich blood to the left atrium, which pumps it into the left ventricle, restarting the cycle.
De-oxygenated blood coming from the body enters the right atria through the coronary sinus, inferior vena cava and superior vena cava. Atrial contraction then forces blood through the tricuspid valve into the right ventricle. Upon contraction the blood is forced up into the pulmonary artery which takes blood to the lungs where it is oxygenated. This oxygenated blood is then brought back to the heart via 4 pulmonary veins which enter the left atrium. After atrial contraction the blood is forced down through the mitral valve into the left ventricle and upon contraction is forced up through the aortic valve into the aorta. This blood is then pumped around the whole body due to a massive pressure head created by the left ventricle. Blood is then brought back to the heart through a series of systemic veins and the cycle starts all over again. **The term blood flow is a very commonly used term at degree level physiology. So the comment about how blood doesnt flow it is pumped is BS.
