B7 blood and the circulatory system
OCR 21st century B7
- Created by: Sara
- Created on: 13-01-13 19:43
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- Blood and The Circulatory System
- Transports various substances around the body
- Blood carries oxygen and glucose to the muscles and takes urea and carbon dioxide away from them
- Blood made up of lots of things
- Plasma
- Liquid that carries nutrients (glucose and amino acids), antibodies, hormones and waste
- Red blood cells
- Transports oxygen from the lungs to rest of body
- No nucleus- packed full of haemoglobin
- Biconcave shape- large area for exchanging oxygen
- White blood cells
- Helps body to fight infection from microorganisms
- Platelets
- Small fragments of cells that help your blood to clot at the site of a wound
- Plasma
- Double circulatory system
- Two circuits joined together
- First one pumps deoxygenated blood to the lungs to take in oxygen. Blood then goes to heart
- Second one pumps oxygenated blood around the body. Blood then gives up oxygenated blood at body cells. Blood returns to heart to be pumped to lungs again
- The heart
- The right atrium of the heart receives dexoygenated blood (via vena cava
- Deoxygenated blood moves through to right ventricle- pumps to lungs (via pulmonary artery)
- Left atrium recieves oxygenated blood from the lungs (via pulmonary vein)
- Oxygenated blood to left ventricle- pumps around body (via aorta)
- Left ventricle wall thicker than right ventricle wall as blood needs to be pumped all over the body (right only to lungs)
- Valves in heart prevent backflow of blood (veins also have valves)
- Two coronary arteries (suppy heart muscle cells with blood)
- Transports various substances around the body
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