Earthworms and sea stars don't have white blood cells like yours. Instead, they have coelomocytes: wandering cells that gobble up germs!
Drag to turn it around. Use the buttons to zoom in and try things from the lessons.
The 3D model can't load right now. Check your internet connection, or try a different web browser.
Earthworms wiggle through garden soil. Sea stars (also called starfish) creep along rocks in the ocean. They look nothing alike, but both have a space inside their bodies filled with fluid.
Coelomocytes float and crawl around in that fluid. Many of them are blobby and can change shape. They push out arms of the cell to move and to grab things.
They are a lot like your white blood cells!
Scroll up to the 3D model and press Gobble a germ.
This keeps the animal safe from germs, even though it lives in dirt or seawater full of them.
Sea stars and earthworms are very different animals, but scientists found that both use the same smart trick to fight germs: cells that eat them.
By SciShow Kids. A fun video for kids.
Watch on YouTube →