How many chambers does the human heart have?
Quick Answer
The human heart has four chambers: two atria and two ventricles. This layout lets the heart separate oxygen-poor blood from oxygen-rich blood.
The Full Story
The human heart has four chambers: the right atrium, right ventricle, left atrium, and left ventricle. The right side sends blood to the lungs to pick up oxygen, while the left side pumps oxygen-rich blood to the rest of the body. Valves between the chambers keep blood moving in one direction and prevent backflow. The left ventricle is the strongest chamber because it must pump blood through the entire body. This four-chamber design is one reason mammals and birds can support high activity levels.
Key Facts
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"The heart’s four-room design is a masterpiece of plumbing."
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