what is meant by double circulation of blood? write to advantages of it in human beings. give two example having three chamber heart.
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Answer:
•The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.
•During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
•Birds and mammals have four chambered heart, having two auricles and two ventricles. Reptiles, except crocodile, have three chambered heart. ... Thus Dolphin being a mammal has four chambered heart. Salamander being an amphibian has a three chambered heart.