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Your heart beats about 100,000 times every day, pumping blood through your body. Your blood contains red blood cells , white blood cells , platelets, and plasma , each with different functions.
lood is made up of tiny cells. Most of them are
red, which is why blood looks red. Red blood cells carry oxygen to all parts of the body. A single drop of blood contains millions of red blood cells which constantly travel through your body delivering oxygen and removing waste. Blood is made up other kinds of cells, too.
Red blood cell
White blood cell
lasma is a yellowish liquid that carries nutrients, hormones, and proteins throughout the body. Plasma is mostly water, absorbed from the intestines from what you drink and eat, with the liver supplying important proteins.
• White blood cells battle germs that invade the body. • Platelets are cells that get sticky and thick when they come into contact with air.When you get a cut, the platelets get gooey and plug up the cut.
Platelet
If you weigh 80 pounds:
If you weigh 50 pounds:
If you weigh 100 pounds:
milliliters or about pints
milliliters or about pints
milliliters or about pints
se the code to find out how much blood is in each of the kids at left. Which one is closest to your weight?
How many hearts can you nd on this page?
© Vicki Whiting May 2026
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