The Cardiovascular SystemBy Ethan H

The cardiovascular system is a complicated system. It involves the heart, lungs, arteries, veins and capalliers.The purpose of the heart is to pump the blood around the body. It needs to pump the blood to all body parts from head to toe. You also need it to pump so all your body parts get oxygen. The oxygen helps you live.The non-oxygenated blood goes through the right atrium and into the right ventricle. Then it goes through the pulmonary arteries and into the lungs to get re-oxygenated. After that it goes into the left atrium then left ventricle and out the aorta and into the body to supply tissues with fresh oxygen.There are 4 valves within your heart to keep the blood moving around the body. Theyre called tricuspid, mitral, aortic and pulmonary valve and all open only one way. Each valve opens and closes once per heart beat (or second). A beating heart contracts and relaxes. When It contracts its called Systole and Relaxes is called diastole.The heart is the centre of the cardiovascular system which is the blood system because its how the blood through your body to give tissues oxygen.