Question

Differentiate between single and double circulation in vertebrates

Answer 1

Single circulation
1. Occurrence: Found in only fishes. 
2. Mode of circulation: Blood passes only once through the heart to supply once to the body. 
3. Nature of blood: Only venous blood passes through the heart. 
4. Efficiency: Less efficient as gill capillaries slow down the blood flow so the body receives blood at a low pressure which decreases the rate of oxygen supply to the cells.
Double circulation
1. Occurrence: Found in amphibians, reptiles, birds and mammals. 
2. Mode of circulation: Blood passes twice through the heart to supply once to the body. 
3. Nature of blood: Mixed or oxygenated or venous blood passes through heart. 
4. Efficiency: More efficient as blood flows at higher pressure, especially in birds and mammals, which increases the rate of food and oxygen supply to the cell and also rapid removal of wastes from them.

Answer 2

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DOUBLE AND SINGLE CIRCULATION

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$\Large\mathcal\pink{DOUBLE \: CIRCULATION}$

Deoxygenated blood from the body tissues is poured into right atrium. Contraction of heart forces it into right ventricle. From right ventricle deoxygenated blood flows to the lungs through pulmonary artery.oxygenated blood from lungs is return into left atrium and then into left ventricle. The left ventricle forces the oxygenated blood to the whole body.thus, for making one complete round of circulation circuit around all body parts, the blood passes through the heart twice.

the pathway of blood from heart to the lungs and back to the heart is called pulmonary circulation and the pathway of blood from heart to the body and back to hurt is called system circulation this is known as double circulation of blood

$\Large\mathcal\orange{SINGLE \: CIRCULATION }$

Single circulation is the type of circulatory system that occurs in fishes in which the blood passes only one through the heart, in each complete circuit of the body compare double circulation “ single circulation a dictionary of biology

In single circulation there is no pulmonary circulation and there is only system circulation . These organism have two chambered heart and the blood is circulated one time from heart to the body

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