Double Circulation: Meaning of Double Circulation, Two Pathways in Double Circulation (For CBSE, ICSE, IAS, NET, NRA 2022)

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Meaning of Double Circulation

  • Double circulation can be defined as the movement of blood in the whole body.
  • Many mammals including humans have a double circulatory system.
  • There are two loops in the human body where the blood circulates.
  • Double circulation involves the flow of:
    • Oxygenated blood or Oxygen rich.
    • Deoxygenated blood i.e.. . little to no oxygen along with a lot of carbon dioxide.
  • The system that is responsible for the transportation of nutrients and gases like oxygen, for the body and metabolic waste products away from the body is the circulatory system.
  • Throughout the body, the heart, and the lungs play an important role in circulating and purification of blood.
Meaning of Double Circulation

Two Pathways in Double Circulation

Pulmonary Circulation

  • Here the blood circulation starts from the right atrium to the left atrium.
  • The blood is collected from the right ventricle and is carried to lungs for oxygenation by the pulmonary artery.
  • The oxygenated blood is pumped back to the left atrium through the pulmonary vein after the purification process.
  • The oxygenated blood is pumped to the aorta for systemic circulation by the left ventricles pump.

Systemic Circulation

  • The oxygenated blood is carried from the left ventricles to the tissue capillaries using Systemic circulation.
  • The oxygen rich blood is transferred to the aorta.
  • The deoxygenated blood is collected later by the veins and venules.
  • The right atrium carries blood to the right ventricle for pulmonary circulation once the deoxygenated blood is received.

Blood Vessels Responsible for Carrying Out Double Circulation

  • Pulmonary artery which takes deoxygenated blood to the lungs.
  • Aorta that carries oxygenated blood to the body tissues.
  • Pulmonary vein that carries oxygenated blood.
  • Vena Cava that takes deoxygenated blood.

Advantages of Double Circulation

  • Double circulation helps in maintaining higher blood pressure.
  • A greater flow of blood to the tissues is allowed.
  • Also responsible for supply of oxygen to different cells of the body.
  • More pressure is created to pump blood around the whole-body tissues and organs.
  • Life processes are maintained using a large amount of energy produced.