Question

Why is blood circulation in the human heart called double circulation?
[2 marks]
[NCERT Exemplar]
[Double Circulation]

Answer 1

Solution:
The blood circulation in the human heart is called double circulation since the blood passes through the heart twice in one complete cycle of the body. [1 Mark]
The blood flows once through the right half of the heart in the form of deoxygenated blood to lungs (pulmonary circulation). [0.5 Marks]
The second time the blood flows through the left half of the heart in the form of oxygenated blood to all the body parts (systemic circulation). [0.5 Marks]
[2 Marks]