why is the circulation in the human body called double circulation. Explain and give its importance.
Answers
Answer:
THERE IS DISTRIBUTION OF OXYGENATED BLOOD TO DIFFERENT PARTS OF BODY.....
AND
REMOVAL OF THE DE-OXYGENATED BLOOD...
DUE TO THIS BOTH PROCESS...
IT'S DOUBLE CIRCULATION
Answer:
Explanation:
The process in which blood passes twice through heart before it is supplied to the rest of the body, is called double circulation.
The heart has different chambers to prevent the oxygen-rich blood from mixing with the blood containing carbon dioxide. The carbon dioxide-rich blood has to reach the lungs for the carbon dioxide to be removed, and the oxygenated blood from the lungs has to be brought back to the heart. This oxygen-rich blood is then pumped to the rest of the body.
We can follow this process step by step. Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left, the left atrium.
The left atrium relaxes when it is collecting this blood. It then contracts, while the next chamber, the left ventricle, relaxes, so that the blood is transferred to it.
When the muscular left ventricle contracts in its turn, the blood is pumped out to the body. De-oxygenated blood comes from the body to the upper chamber on the right, the right atrium, as it relaxes. As the right atrium contracts, the corresponding lower chamber, the right ventricle, dilates.
This transfers blood to the right ventricle, which in turn pumps it to the lungs for oxygenation. Since ventricles have to pump blood into various organs, they have thicker muscular walls than the atria do. Valves ensure that blood does not flow backwards when the atria or ventricles contract
Double circulation ensures the complete separation of oxygenated and deoxygenated blood and movement of blood to body parts under pressure so as to make sufficient supply of oxygen and nutrients to all body parts.