Which heart chamber has the thickest wall?

Which heart chamber has the thickest wall?

• A. The right ventricle
• B. The left ventricle
• C. The right atrium
• D. The left atrium

Answer: (B)

The chamber that has to generate the highest pressure to push blood through the body’s big network of vessels has the thickest wall. That chamber pumps blood into the systemic circulation, so it must create strong, powerful contractions to overcome high resistance—hence a very muscular, thick wall. In contrast, the chamber that sends blood to the lungs works against much lower pressure, so its wall is thinner, and the receiving chambers (the atria) handle blood at even lower pressures with still thinner walls. So the thickest wall belongs to the chamber that drives blood to the entire body.

The chamber that has to generate the highest pressure to push blood through the body’s big network of vessels has the thickest wall. That chamber pumps blood into the systemic circulation, so it must create strong, powerful contractions to overcome high resistance—hence a very muscular, thick wall. In contrast, the chamber that sends blood to the lungs works against much lower pressure, so its wall is thinner, and the receiving chambers (the atria) handle blood at even lower pressures with still thinner walls. So the thickest wall belongs to the chamber that drives blood to the entire body.