Double Circulation: Meaning of Double Circulation, Two Pathways in Double Circulation

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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

Meaning of Double Circulation

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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.