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CBSE - X - Biology

I am not able to understand the circulation of blood through the human heart.Please explain it.

Asked by ndoria2000 7th September 2015, 6:09 PM
Answered by Expert


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.





Answered by Expert 7th September 2015, 6:23 PM

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