Question

Briefly describe the importance of double circulation in mammals. [3 Marks]

Answer 1

Double circulation is seen in mammals apart from birds as these two group of organisms have a four chambered heart. The importance of double circulation is as follows:

a) It helps in preventing the intermixing of oxygenated and deoxygenated blood in mammals. [1 Mark]

b) Organisms showing double circulation demonstrate a greater circulation efficiency as it helps the body to have a dedicated continous supply of oxygen. [1 Mark]

c) Double circulation also ensures that the mammals are able to maintain their internal body temperature. [1 Mark]