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

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.