Heart and blood All about blood Blood is a warm, soupy mixture of liquid and cells. The cells carry oxygen and fight germs, and the liquid carries nutrients to body cells and takes away waste. Main ingredients Blood contains three types of cells – red blood cells, white blood cells, and platelets. They float in a yellowish liquid called plasma. One drop of blood contains 5 million red blood cells, White blood half a million platelet cells, cells seek Lots of out and kill 7,000 white blood cells, plasma germs. They also eat up the water, sugar, salt, dead cells that Yellow plasma they meet. hormones, vitamins, makes up more than half of fat, and protein. your blood. blood red make . White blood ls cel cells and platelets. Become Red blood an expert... on fighting germs, pages 78-79 on air and oxygen, pages 62-63 Red blood cells transport oxygen from your lungs to the rest of your body. 52 How long does a red blood cell live for? All about blood Your blood type There are four main types of blood, called blood groups. Your blood group affects who you can donate blood to. People with blood group People with blood group A A can give blood only to O O can donate blood to people with A or AB. almost anyone. Blood bank One in ten people People with blood group People with blood group who go to hospital need extra AB can only give blood B can give blood only to blood, so hospitals keep a store AB to others with AB blood. B people with B or AB. of blood in a “blood bank”. The blood is divided into separate supplies of cells and plasma. How much blood? The average adult has about White blood ce 10 pints (5.7 litres) of blood, lls but a newborn baby has only a cupful. an dp latelets The amount of blood in your body grows with you. By age 10 you have up to 4 pints figh (2 litres). d t ise se. a Platelets are cells that become sticky to make blood clot and form scabs. By a year old a baby has more than 1 pint (half a litre) of blood. About four months.
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