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34. Given below is a highly schematic diagram of the human blood circulatory system.
Biology | Class 10 | ICSE | Selina | The Circulatory System
34. Given below is a highly schematic diagram of the human blood circulatory system.

(a) Which part (state the number) represents the heart? Give reason in support of your answer.
(b) Which numbers represent the following respectively?
Aorta Superior vena cava Hepatic portal vein Renal vein
Pulmonary artery Stomach

Solution –

  • Which part (state the number) represents the heart? Give reason in support of your answer.

Part 3 represents heart . Blood flows twice in the heart before it completes one cardiac cycle . This why its known as double circulation .

(b numbers represented by
         Aorta – number 5

         Superior vena cava –  number 9

         Hepatic portal vein – number 7

          Renal vein – number 8
         Pulmonary artery – number 1

         Stomach – number 10



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