Different parts make up the cardiovascular system. It is a complex network comprising of the heart, veins, arteries and blood.
The cardiovascular system functions like a transportation system for our bodies and the heart is the motor that keeps it working. The heart is the size of a fist and it pumps blood throughout the body. The heart beats an average of 100,000 beats each day.
The blood that is the vehicle is responsible for carrying oxygen from the lungs and nutrients from the digestive system to the different parts of the body. In addition, the blood also carries deoxygenated blood to the lungs for oxygenation and waste products to the kidneys from where it they are eliminated.
The arteries are responsible for carrying oxygenated blood from the heart to the different parts of the body. The main artery that leaves the heart is known as the aorta. While it is the veins that are responsible for bringing deoxygenated blood back to the heart from where it is sent to the lungs for oxygenation. The pulmonary artery carries the deoxygenated blood to the lungs and the pulmonary vein brings the oxygenated blood back to the heart.
The heart is divided into four chambers which help to keep the oxygenated blood separated from the deoxygenated blood. The two chambers on top of the heart are the left atrium and the right atrium, while the lower two are the left ventricle and the right ventricle. The deoxygenated blood enters the right atrium and then the right ventricle from where it is sent to the lungs. The oxygenated blood is picked up from the lungs and enters the left atrium, then the left ventricle and from there it is sent to all the organs, tissues and cells of the body.
The left and right atria function as storage while the left and right ventricles are the pumps that push the blood out of the heart.
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