Final answer:
The heart has four chambers: two atria and two ventricles, with atria serving as receiving chambers and ventricles as pumping chambers.
Explanation:
The heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers). Atria act as receiving chambers, pumping blood into the ventricles. Ventricles are the main pumping chambers, pushing blood out of the heart.
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