Human Body Systems 3.1.1-3.1.3

3.3.1- The Human Heart

• The heart is made up of four sections called chambers: the left atrium, the right atrium, the left ventricle, and the right ventricle, each playing a crucial role in the circulatory process.

• The left atrium receives oxygenated blood from the lungs through the pulmonary veins.

  • It is connected to the left ventricle, which pumps the oxygen-rich blood out to the body through the aorta.

• The right atrium collects deoxygenated blood from the body via the superior and inferior vena cavae, ensuring that all blood returns to the heart for reoxygenation.

  • It is connected to the right ventricle, which then sends the deoxygenated blood to the lungs for gas exchange.