ANATOMY

Detailed explanation-1: -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-2: -The ventricles of the heart have thicker muscular walls than the atria. This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria. The left ventricle also has a thicker muscular wall than the right ventricle, as seen in the adjacent image.

Detailed explanation-3: -Ventricles have thicker walls than auricles because they have to pump blood to different organs and the pressure with which the blood flows through them is more than the auricles. Therefore, the walls are thicker in ventricles than in auricles.

Detailed explanation-4: -The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart.

Detailed explanation-5: -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.