Ventricles have thicker walls than auricles. Why?

The ventricles of the heart have thicker muscular walls compared to the auricles. This is because the ventricles pump blood out of the heart at a much higher pressure than the auricles. The ventricles are responsible for pumping blood to various parts of the body.

Additional Information:

• The heart is a muscular organ found in most animals, responsible for pumping blood through the circulatory system to all parts of the body.
• The blood pumped by the heart carries oxygen and nutrients to the body and removes metabolic waste like carbon dioxide, which is transported to the lungs.
• In humans, the heart is approximately the size of a closed fist and is located in the middle of the chest, between the lungs.
• The heart has four chambers:
  • Two atria (upper chambers)
  • Two ventricles (lower chambers)
• The walls of the heart consist of three layers:
  1. Endocardium (inner layer)
  2. Myocardium (middle layer)
  3. Epicardium (outer layer)
• The heart is surrounded by a protective double-membraned layer called the pericardium.
• Pacemaker cells in the sinoatrial node (SA node) regulate the rhythm of the heart's pumping action.
• The right atrium receives blood from the body through the superior and inferior venae cavae.
• The left atrium receives oxygenated blood from the lungs through the pulmonary veins.