Question

Difference between w single and double circulation

Answer 1

Answer:

Single circulation

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

* Occurs only in fishes

* 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.

* This increases the rate of supply of food and oxygen to the cell and also rapid removal of wastes from them.

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Answer 2

$\huge\bold\red{~❖~}$ $\sf\underline\green{ Single \: Circuit \: Circulation }$

1. The blood passes through the heart only once in circulation.
2. Pulmonary circulation is absent.
3. Heart consists of two chambers.
4. It occurs in fishes.

$\huge\bold\red{~❖~}$ $\sf\underline\blue{ Double \: Circuit \: Circulation }$

1. Blood passes twice through the heart.
2. Pulmonary circulation is present.
3. Heart consists of three or four chambers.
4. It occurs in frogs, lizards, birds and mammals.