Explain the advantage of the complete partition of ventricle among birds and mammals and hence leading to double circulation.

Dear student,

Circulation is the movement of fluid (blood, lymph etc) throughout the body by vessels and circuits under the action of heart.

Four chambered heart in mammals and birds contains two auricles (left and right) and two ventricles (left and right). The left part of the heart contains oxygenated blood and the right part of the heart contains deoxygenated blood. Thus blood passes two times in one complete circuit – one with oxygenated blood and another with deoxygenated blood. This is double circulation. Double circulation system prevents mixing of oxygenated and deoxygenated blood with each other.

  • Oxygenated blood from the lungs enters the left auricle through the pulmonary vein.
  • At the same time deoxygenated blood collected from the body enters into the right auricles through inferior and superior vena cava.
  • When both the auricles are filled they contract together.
  • The blood from left auricle travels to the left ventricle and the right auricle passes blood into right ventricle.
  • When both the ventricles are filled with blood, they contract.
  • As a result of contraction the oxygenated blood from left ventricle passes to the various parts of the body through systemic aorta whereas the deoxygenated blood from right ventricles are carried to the lungs for purification by pulmonary aorta.
  • Again, after purification blood mixed with oxygen enters inside the left auricle and the blood from body parts carrying carbon dioxide enters the right auricles.
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​​Regards

 

 

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