ANATOMY

Detailed explanation-1: -The muscular walls of ventricles are thicker compared to atria as they have to pump blood out of the heart. They pump blood at a higher pressure to ensure it reaches all parts of the body.

Detailed explanation-2: -The walls of the left ventricle are about 3 times thicker from the right ventricle, while the atria acts as a collecting chamber for the blood which is starting to the heart thus have thin walls. Also, they have to force the blood into the ventricles that lie just below there thus atria have thin walls.

Detailed explanation-3: -A typical heart has two upper and two lower chambers. The upper chambers, the right and left atria, receive incoming blood. The lower chambers, the more muscular right and left ventricles, pump blood out of the heart.

Detailed explanation-4: -Heart Chambers. Your heart chambers are four hollow spaces within your heart. Your upper chambers are called your right atrium and left atrium. Your lower chambers are called your right ventricle and left ventricle.

Detailed explanation-5: -The walls of ventricles are much thicker than atria.