人体
血液は全身を流れています。血液は体のすみずみに酸素や栄養分を届けたり、悪い病原菌を退治したりする働きがあります。血液をいつも全身...
消化とは、食べたものを細かくしたり、水に溶けやすくしたりすることです。消化することで食べ物は体内に入ります。消化は、私たちが生き...
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