Question

Mention 4 difference between double and single circulation

Answer 1

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Answer 2

Single circulation

* Blood flows only once through the heart during one cycle of passage through the body.

* Occurs only in fishes.

* Only venous blood passes through the heart

* Less efficient as gill capillaries slow down the blood flow, hence the body receives blood at a low pressure which decreases the rate of oxygen supply to the cells.

Double circulation

* Blood flows twice through the heart during one cycle of passage through the body.

* Occurs in all other vertebrates other than fishes.

* Mixed or oxygenated or venous blood passes through the heart.

* More efficient as blood flows at higher pressure especially in birds and mammals. This increases the rate of supply of food and oxygen to the cell and also rapid removal of wastes from them.