CBSE Class 10 Answered

Hi Muskan,

• There is double circulation of blood in the human heart.
• Double circulation means blood passes through the heart twice.
• This is possible in the heart because of its division into the right and the left halves by an atrioventricular septum.
• The right half of the heart deals with deoxygenated blood and the left heart deals with oxygenated blood.
• Hence, blood in the body circulates in two ways.
  • Pulmonary Circulation
  • Systemic Circulation
• Pulmonary Circulation
  • Blood in the right ventricle is pumped into the pulmonary arteries.
  • The pulmonary arteries carry the deoxygenated blood to lungs for oxygenation.
  • Oxygenated blood from the lungs is sent to the left atrium via pulmonary veins.
  • This circulation of blood via pulmonary blood vessels is called pulmonary circulation.
• Systemic Circulation
  • It pertains to the major circulation of the body.
  • Oxygenated blood from the left ventricle is pumped into the aorta.
  • It is further carried by the arteries, the arterioles and the network of blood capillaries.
  • On the other side, deoxygenated blood is collected in the right atrium through the superior and inferior vena cavae.
  • Systemic circulation provides oxygen and nutrients and carries away carbon dioxide and other harmful substances for elimination.