Explain the General plan of circulatory system of vertebrates with the help of single circuit circulation and double circuit circulation?

Explain the General plan of circulatory system of vertebrates with the help of single circuit circulation and double circuit circulation?  
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1 Answer

Answer :

Single Circuit Circulation: -

• Deoxygenated blood from all tissues of body enters the sinus venosus from where it passes into the single atrium.

• From atrium blood goes into ventricle from where it is pumped to gills for oxygenation.

• From gills blood is directly distributed to all parts of body.

• As blood circulates once through heart hence it is called single circuit circulation.

Double Circuit Circulation: -

• In this type atrium and ventricle is divided into two chambers each.

• In this method atrium is divided into right and left atrium

• The division of ventricle is different in different animals.

• However oxygenated and deoxygenated blood is completely separated.

• Left Atrium receives de-oxygenated blood and sends it to ventricle. Ventricle then sends it to lungs for oxygenations. Lungs again send this blood to right

Atrium, which send it to ventricle. Ventricle send this oxygenated blood to all parts of body.

• As the blood circulates twice the heart hence it is called double circuit circulation. 
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