Double Circulation: Types of Circulatory Systems, Single Circulation (For CBSE, ICSE, IAS, NET, NRA 2022)

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Types of Circulatory System

  • Humans just like majority of mammals use a double circulatory system.
  • Animals have open circulatory and closed circulatory system.
Single and Double Circulation

Single Circulation

  • The blood will pass through the heart to gills.
  • The blood is distributed to the different parts of the body after the purification.
  • Due to completion of only one cardiac cycle single circulation has been named.
  • Single circulation is observed in birds, fish, reptiles, etc.

Double Circulation

  • Double circulation name is because the blood follows two routes one for oxygenated blood and the other for deoxygenated blood.
  • Humans make use of the double circulatory system just like many mammals.

Human Heart and Its Division

The Heart, Showing Valves, Arteries and Veins

Four Chambers

  • Left Atria-The left atrium collects blood from the pulmonary veins and ejects it into the left ventricle.
  • Right Atria- The right atrium acts as the first chamber of the heart to receive deoxygenated and carbon dioxide-rich systemic blood from the body.
  • Left Ventricles- To pump oxygenated blood from the lungs out to the body.
  • Right Ventricles- This is responsible for pumping oxygen-depleted blood to the lungs.


Q 1. For what reason, the blood circulation in the human heart is called double Circulation?


  • Since the blood enters twice to the heart and blood escapes twice from the heart via arteries and veins.
  • Also due to the presence of four chambered hearts.

Q 2. What is the most important reason for which double circulation in human beings become essential?


Double circulation is responsible for allowing the separation of oxygenated and deoxygenated blood in the body.

Q 3. What are the two types of circulation in the human body w. r. t Double circulation?


There are two types of circulation in the human body that are responsible for Double circulation.

  • Pulmonary circulation.
  • Systemic Circulation.

Q 4. List out the names of the four chambers of the heart?


Four chambers of the heart are:

i) Left Atria

ii) Right Atria

iii) Left Ventricles

iv) Right Ventricles

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