Final answer:
The human heart contains 4 chambers: 2 atria and 2 ventricles, which ensure efficient blood flow throughout the body.
Step-by-step explanation:
The human heart contains 4 chambers: 2 atria and 2 ventricles. The atria receive blood from the veins and pump it into the ventricles. The ventricles then pump the blood out of the heart into the arteries. This separation of chambers allows for efficient and controlled blood flow throughout the body.
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