The heart is a muscular organ that pumps blood throughout the body, delivering oxygen and nutrients to cells and removing waste products. It's a key component of the circulatory system, working with blood vessels to ensure blood flow to all parts a hollow muscular organ of vertebrates that expands and contracts to move blood through the arteries, veins, and capillaries. b. : a structure in an invertebrate that serves a purpose like that of the heart of a vertebrate.8 May 2025 HEART Definition & Meaning - Merriam-Webster
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