11. Describe double circulation of blood in human beings. Why is it necessary?
Answers
double circulation means that first of all the blood is collected from all parts of the body and it goes through heart it goes through right auricle then into the right ventricle and then it is pumped into the lungs where it completes its second round of circulation and comes back to the left auricle and then into the left ventricle like this it completes two rounds this is called double circulation
in other ways I can say that the first way of circulation is that first blood is collected from the body and it goes to the heart this is called the first round and then the second round is when the deoxygenated blood converts into the oxygenated blood and comes to hath once again like this it goes through two times through the heart this is called double circulation and it is necessary because this is the way how blood is oxygenated and then we can make use of that blood
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Answer:
Blood enters the heart
Deoxygenated blood from the body enters into the right atrium of the heart.
Blood pumped to lungs
This deoxygenated blood is pumped out of the heart and towards the lungs by the right ventricle.
Lungs oxygenate the blood
At the lungs, the deoxygenated blood exchanges carbon dioxide for oxygen. This is how it becomes oxygenated (contains oxygen).
Blood returns to the heart
Oxygenated blood returns to the left atrium of the heart.
Blood pumped to the body
This oxygenated blood is pumped out of the heart and to the body by the left ventricle.
Blood returns to the heart
The oxygenated blood gives its oxygen to body cells in exchange for carbon dioxide. The blood becomes deoxygenated and returns to the heart.
Mammals have a double circulatory system. This means that during a single cycle, the blood goes twice in the heart. There are two loops in which blood is circulated. One loop is oxygenated and the other is de-oxygenated. This double circulatory system is important because it ensures provision of oxygenated blood to the muscle and not a mixture of oxygenated and de-oxygenated blood. Hence, this system ensures efficient supply of oxygenated blood to the muscles