Heart - A powerful muscle that is located between the lungs. It is protected by the ribcage and is responsible for pumping blood around the body. This pumping is what forces oxygenated blood (blood containing oxygen) around the rest of the body., Veins - These carry the oxygen-rich blood away from the heart to the rest of the body., Arteries - These carry blood containing little or no oxygen from the capillaries, back to the heart, ready to be sent to the lungs for reoxygenation (filling up with oxygen)., Lungs - These organs are full of air sacs. They suck in air, rich in oxygen, then transfer this into the bloodstream. They remove carbon dioxide from the blood and exhale it from the body., Capillaries - These enable the body to transfer oxygen from the blood into the muscles and cells. They are tiny and it is estimated that there are 10 billion of these in the human body., Red blood cells - These travel around inside the blood. They are responsible for carrying oxygen and carbon dioxide within the blood. If you imagine that the circulatory system is the road network of the body, then these are the cars., Alveoli - These are small, cauliflower-shaped sacs that are found inside the lungs. Their job is to transfer the oxygen from the air into the bloodstream via a small area of moisture. Carbon dioxide is removed from the blood through this same, moist area. ,

Circulatory System

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