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Already checked? You can find even more exciting videos in the Checker World of the ARD media library: https://1.ard.de/checkerwelt. ???? In this exciting episode, Marina takes you on an extraordinary journey through a gigantic, walk-in heart in the children's museum. Discover together how our heart muscle is constructed and what vital functions it performs. But that's not all! Marina also gets to the bottom of the question: What happens when our heart gets out of rhythm? Join us and learn fascinating facts about the heart that you've never heard before! Comments are deactivated to protect minors. You can email questions or comments to [email protected].