Final answer:
The heart has four chambers, consisting of two atria and two ventricles.
Explanation:
The heart contains four chambers: two atria and two ventricles. Atria receive blood and contract to push it into the ventricles, while ventricles pump blood out of the heart. Humans, birds, and mammals possess a four-chambered heart, which separates oxygenated and deoxygenated blood, providing efficiency in circulation.
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