Question

Why is circulation of blood in man known as double circulation

Answer 1

Because the flow of blood is twice through the heart during each cycle is called the double circulation.Blood flows from heart to the entire body to carry Oxygen to them ad return back to heart as de-oxygenated blood;then it moves to the lungs for oxygenation and flows back to heart as oxygenated blood.Double circulation prevents mixing of de-oxygenated blood with oxygenated blood completely.It helps in transport of oxygen to all parts of the body efficiently.Birds and mammals being warm blooded animals need more energy to maintain constant body temperature for which they need more oxygen.Thus,Double Circulation is necessary in human beings :)

Answer 2

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$\Large\fbox{\color{purple}{QUESTION}}$

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 circulationand 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

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