Question

explain double circulation of heart in a human

Answer 1

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✔✔In double circulation, there are two loops or cicuits where the blood travels to the heart - systemic and pulmonary.
In other words the blood flows through the heart twice. Double circulation is important to ensure a supply of pure oxygenated blood to tissues and muscles instead of a mix of oxygenated and deoxygenated blood.

✔✔In this circulation, the heart consists of the right side that pumps deoxygenated blood into the pulmonary section and the left side that pumps deoxygenated blood into the systemic circulation.

✔✔Systemic Circulations: starts from left atrium to left ventricle. This transfers the oxygen rich blood to aorta for the supply to various parts of the body.
Pulmonary Circulation: the pulmonary artery collects the blood from right ventricle and passes to lungs for oxygenation. Lungs purify this supply of deoxygenated blood, then the blood is pumped back to left atrium of the heart.
Thus it ensures the high supply of oxygen.

✔✔Double circulation is common among mammals and birds.

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Answer 2

Answer:

• The deoxygenated blood from body is taken to the heart through veins.

• This blood first enters the right auricle from superior and inferior vena cava and then through the tricuspid valves, it goes to right ventricle.

• Now , from here the deoxygenated blood goes to lungs for purification through pulmonary arteries.
• After purification , the oxygenated blood is transferred to left auricle by the pulmonary veins .
• From left auricle , it goes to left ventricle via the bicuspid valve.
• Now, from here it released out through aorta and is distributed in the body via arteries.
• In this process the blood enters twice the heart, so this process is called double circulation .