Fun Science Facts
If all your blood vessels (tubes) were laid end to end, they would stretch from New York to California and back more than ten times — a highway built right inside you!
Blood - Facts for Kids
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Facts About Blood For Kids
Your blood is about as salty as your tears, but way less salty than ocean water!
Scientists can now make artificial (fake) blood in laboratories (science rooms) to help people who need it!
Blood makes up about 1/13th of your body weight – that’s like carrying a small laptop’s weight in blood!
The word “blood” appears in over 50 common English phrases, like “blood, sweat, and tears”!
Some animals, like octopuses, have blue blood because they use copper instead of iron to carry oxygen!
The first successful blood transfusion (giving blood to someone else) was performed in 1665 – that’s over 350 years ago!
Special Properties
Your blood is slightly alkaline (not acidic), with a pH between 7.35 and 7.45!
Blood plasma (blood juice) is about 90-92% water and about 8-10% dissolved substances (things mixed in) like proteins and minerals!
Blood can push against gravity (the force that pulls things down) to reach your brain when you stand up!
Your blood pressure (how hard blood pushes) changes throughout the day based on what you’re doing!
Blood contains special proteins (body helpers) called antibodies (germ fighters) that remember how to fight specific germs!
The temperature of your blood stays constant (the same) even when outside temperatures change!
Your blood carries hormones (chemical messages) that help control your mood and energy levels!
Blood helps maintain (keep) the right balance of water in all your body’s cells!
Your blood pressure is strongest when it leaves your heart and gentlest in your small capillaries (tiniest tubes)!
Connection to Other Body Parts
Your blood connects every organ in your body, like an underground railway system!
Blood delivers calcium (bone helper) to your bones to keep them strong and healthy!
Your muscles receive oxygen from blood to help them move and grow!
Blood carries nutrients (food for your body) to your brain to help you think and learn!
Your skin color comes partly from the blood vessels (tubes) visible through it!
Blood helps your joints (where bones meet) move smoothly by removing waste products!
Your digestive system (stomach area) adds nutrients to your blood after you eat!
Blood helps your eyes function (work) by bringing them oxygen and nutrients!
Your kidneys (body filters) filter about 120–150 quarts of blood every day!
Blood carries warmth to your fingers and toes to keep them working properly!
Protection & Defense
Your blood contains five different types of white blood cells, each with a special job!
Blood clotting (making sticky patches) helps prevent you from losing too much blood when you get a cut!
Special blood cells called phagocytes (cell eaters) can eat harmful bacteria like tiny pac-men!
Your blood carries antibodies (germ fighters) that remember how to fight diseases you’ve had before!
Blood helps remove toxins (bad stuff) from your body through your liver and kidneys!
White blood cells can multiply (make more of themselves) quickly when they detect an infection!
Your blood contains proteins (body helpers) that help heal wounds and fight inflammation (swelling)!
Blood vessels (tubes) can narrow to prevent blood loss when you’re injured!
Your immune system (body’s defense team) uses blood to transport defender cells throughout your body!
Blood helps maintain (keep) your body’s pH balance (not too acidic) to keep you healthy!
Medical Science & Research
Doctors can see your blood cells using microscopes (tools that make things look bigger) that magnify them up to 1,000 times!
Blood types were discovered in 1901 by Karl Landsteiner, saving many lives!
Scientists have found that certain blood types might be more resistant (stronger against) some diseases!
Blood tests can now detect (find) some cancers before other symptoms (warning signs) appear!
Scientists have discovered that blood can tell us about our ancestors (family from long ago) from thousands of years ago!
Blood donation (giving blood to help others) helps save millions of lives every year around the world!
Modern blood tests can give results in just a few minutes instead of days!
