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Describe double circulation of blood in ...

Describe double circulation of blood in human beings. Why is it necessary?

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During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separte oxygenated and de-oxygenated blood because this makes thrir circulatory system is more efficient and helps in maintaining constant body temperature.
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NCERT-LIFE PROCESSES-Exercise
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  13. What is the role of saliva in the digestion of food?

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  14. What are the necessary conditions for autotrophic nutrition and what a...

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  16. How are the alveoli designed to maximise the exchange of gases?

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