system
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human
Replace complex terms with simpler synonyms in this paragraph discussing the structure of the heart.

Relevant data:
"The heart is a muscular organ that pumps blood throughout the body via the circulatory system. It consists of four chambers, each with a specific function in the circulation of blood."
gpt
The heart is a strong muscle that moves blood around the body through tubes. There are four parts, each which helps blood move in a different way.