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c). The human heart is about the size of an adult's fist.
A fist-sized organ, the heart circulates blood throughout your body. It serves as your circulatory system's main organ.
Four major muscle-driven chambers make up your heart; they are each powered by electrical impulses. Your nervous system and brain control how your heart beats.
The main organ of your circulatory system, a web of blood vessels that circulates blood throughout your body, is your heart. It also interacts with other bodily systems to regulate your blood pressure and heart rate. Your lifestyle, family history, and medical history are all factors that determine how well your heart functions.
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