The chambers that are larger and more muscular are the?

The chambers that are larger and more muscular are the?

• A. Atria
• B. Ventricles
• C. Pulmonary trunk
• D. Aorta

Answer: (B)

The main idea is that the pumping chambers of the heart have thick, muscular walls because they generate the force needed to push blood out of the heart. The ventricles are larger and more muscular to eject blood either to the lungs (right ventricle) or to the rest of the body (left ventricle), which requires higher pressure. The atria are thinner-walled receiving rooms that collect blood and pass it into the ventricles, so they don’t need as much muscle. The pulmonary trunk and aorta are large vessels, not chambers, so they don’t fit the description of large, muscular chambers.

The main idea is that the pumping chambers of the heart have thick, muscular walls because they generate the force needed to push blood out of the heart. The ventricles are larger and more muscular to eject blood either to the lungs (right ventricle) or to the rest of the body (left ventricle), which requires higher pressure. The atria are thinner-walled receiving rooms that collect blood and pass it into the ventricles, so they don’t need as much muscle. The pulmonary trunk and aorta are large vessels, not chambers, so they don’t fit the description of large, muscular chambers.