need inf. on blood circulation?

Question

urgent please

Answer 1

Try WebMD

http://www.webmd.com/search/search_results/default.aspx?sourceType=all&query=blood%20circulation%20

Answer 2

Mammalian circulation
Deoxygenated blood (containing little or no oxygen) collects in two major veins: the superior vena cava and the inferior vena cava. The superior and inferior vena cava empty into the right atrium. The coronary sinus which brings blood back from the heart itself also empties into the right atrium. The right atrium is the larger of the two atria although it recieves the same amount of blood. The blood is then pumped through the tricuspid atrioventricular valve into the right ventricle. From the right ventricle, blood is pumped through the pulmonary semi-lunar valve into the pulmonary trunk. The deoxygenated blood leaves the heart by the pulmonary arteries and travels through the lungs (where it is oxygenated) and into the pulmonary veins. The oxygenated blood then enters the left atrium. The blood then travels through the bicuspid valve, also called mitral valve, into the left ventricle. The left ventricle is thicker and more muscular than the right ventricle because it pumps blood at a higher pressure. From the left ventricle, blood is pumped through the semi-lunar valve into the aorta. Once the blood goes through systemic circulation, deoxygenated blood will again collect inside the vena cava and the process will continue