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Please explain double circulation with help of a diagram

Dear student,

Mammalian heart is 4 chambered, with 2 lower chambers called ventricles ( ventricle singular) and 2 upper chambers termed as atria (atrium singular). The blood passes through the heart twice in one complete cycle (pulmonary circulation and systemic circulation). This helps in complete separation of deoxygenated from the oxygenated blood, thus increasing the overall efficiency of circulation of oxygenated blood through the body. Since the blood goes twice through the heart, it is known as  double circulation.

The path is as following:
The right auricle of heart contracts and passes the deoxygenated blood to the right ventricle, through an auriculo-ventricular aperture (tricuspid valve). The right ventricle contracts and passes the deoxygenated blood into the two pulmonary arteries, which pumps it to the lungs where the blood is oxygenated. From the lungs, the pulmonary veins transport the oxygenated blood to the left atrium of the heart.

​​​​​​The left atrium contracts and through the auriculo-ventricular aperture (bicuspid valve), the oxygenated blood enters the left ventricle. The blood passes to aorta from the left ventricle. The aorta gives rise to many arteries that distribute the oxygenated blood to all the regions of the body.

Regards,

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The deoxygenated blood comes to the heart through veins. It is oxygenated in the lungs and comes back to the heart. From heart oxygenated blood is distributed to all parts of the body. Since blood flows twice through the heart in one cycle, it is called double circulation.
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describe double circulation in human beings why it is necessary - Biology - TopperLearning.com | d0412wdd  DIAGRAM
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Dear student,

Human heart have four chambers 2 upper chambers called atria and 2 lower called ventricles

The right part of the heart is concerned with venous blood and left part with the oxygenated blood. In one complete circuit in the body the blood passes twice through the heart, once through its right side and then through its left side.

This type of bi-circulation of blood is known as double circulation. The complete separation of ventricles into two chambers enables the venous and oxygenated blood not to mix. However, the circulation of blood in the body parts from the heart can be represented as given below.

Oxygenated blood ? left auricle ? left ventricle ? carotico systemic aorta ? arteries ? arterioles ? and arterial capillaries ? organs ? venous capillaries and venules (venous blood) ? veins ? precavals and postcaval ? right auricle ? right ventricle ? pulmonary aorta ? pulmonary aorta ? pulmontary arteries ? lungs (for purification) ? pulmonary veins ? left auricle (oxygenated blood).

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Dear student,

Human heart have four chambers 2 upper chambers called atria and 2 lower called ventricles

The right part of the heart is concerned with venous blood and left part with the oxygenated blood. In one complete circuit in the body the blood passes twice through the heart, once through its right side and then through its left side.

This type of bi-circulation of blood is known as double circulation. The complete separation of ventricles into two chambers enables the venous and oxygenated blood not to mix. However, the circulation of blood in the body parts from the heart can be represented as given below.

Oxygenated blood - left auricle - left ventricle - carotico systemic aorta - arteries - arterioles - and arterial capillaries - organs - venous capillaries and venules (venous blood) - veins - precavals and postcaval - right auricle - right ventricle - pulmonary aorta - pulmonary aorta - pulmontary arteries - lungs (for purification) - pulmonary veins - left auricle (oxygenated blood).

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