Question

Differentiate between double circulation and single circulation of blood with examples.

Answer 1

The main difference between single circulatory systems and double circulatory systems is that in the case of single circulatory systems, blood passes through the heart only once on each circuit around the whole of the blood circulation system of the animal.
In a ​​​​​double circulatory system, there are 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 is rich in carbon dioxide. [2 Marks]

Example of single circulation - found only in fishes.
Example of incomplete double circulation - Found in amphibians and reptiles.
Example of complete double circulation - Found in birds and mammals. [3 Marks]