Cardiovascular and Circulatory System Essay

Submitted By evajoji
Words: 1481
Pages: 6


cardiovascular system is a network made up of blood vessels and your heart, which is responsible for pumping blood and oxygen around your body. It also transports carbon dioxide, a waste product, from your body to your lungs – breathing out removes carbon dioxide from your body.
The heart is a hollow, muscular organ, It lies just to the left side of the centre of your chest (thorax) and is surrounded by a protective membrane called the pericardium.Your heart is a pump, divided into left and right sides by a vertical wall called the septum. These two chambers are further divided into the thin walled atrium above, and a thick walled ventricle below, making four chambers. Between each pair of chambers are valves preventing any back flow of blood. Blood flows from each atrium to the ventricle below, through a one-way valve. It has walls, made of muscle, which squeeze (contract) to pump blood into your blood vessels and around your body. You have around 8 pints of blood in your body, and in an average day your heart beats about 100,000 times to keep your blood circulating.
When you breathe in air through your mouth and nose it travels to your lungs. Oxygen from the air is absorbed into your bloodstream through your lungs. Your heart then pumps oxygen-rich (oxygenated) blood through a network of blood vessels (arteries) to tissues including your organs, muscles and nerves, all around your body.When blood reaches the capillaries in your tissues it releases oxygen, which cells use to function. Cells release waste products, such as carbon dioxide and water, which your blood absorbs and carries away. The used (deoxygenated) blood then travels through your veins and back towards your heart. Your heart pumps the deoxygenated blood back to your lungs, where it absorbs fresh oxygen, releases the carbon dioxide and the cycle starts again.=====THESE ARE SAME MEANING BUT DIFFERENT PARAGRAPH.CHOOSE ANY ONE. ===== (Your veins deliver deoxygenated blood from your body to the right side of…