ELI5 if heart and lungs are technically a

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ELI5 if heart and lungs are technically a muscle. Why dont they grow stronger and larger as we grow?

When u move your hand 50 times, the muscles in it get streched enough and regrow stronger and expand a little. But heart and lungs are moving every second? They dont get more larger in size?
#education

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ELI5 if heart and lungs are technically a muscle. Why dont…

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