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Circulatory System: Blood!
7SCIENCE
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What is blood?• Blood makes up around 8% of
your body weight (5L!)• Consists of:– Cells and liquid
• Blood has many parts:– Plasma
• Liquid part of blood, mostly water
– Red blood cells• Has hemoglobin, important for carrying oxygen and carbon dioxide
– White blood cells• Fight bacteria and other foreign substances
– Platelets• Pieces of cells that help form blood clots (stop bleeding)
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Why is it important to study?
Has many functions:• Carries oxygen from your lungs to
the rest of the body• Removes carbon dioxide from body cells and carries it
to your lungs to beremoved
• Carries wastes from your kidneys
• Transports nutrients• Fights infections
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Blood Types
Blood Transfusion Possibilities
Type Can RECEIVE Can DONATE to
A O, A A, AB
B O, B B, AB
AB O, A, B, AB AB
O O O, A, B, AB
• There may be times you need to receive blood– Ex. surgery, accident
• This is called a blood transfusion– Must be the right type!– If it is the WRONG type, the blood cells will clump together and
clog the blood vessel
4 Blood Types: A,B, AB and O
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To figure out blood types:
• Blood Type Calculator - if you know yours or your parents' blood types