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Answer 1

HEY MATE HERE IS YOUR ANSWER:-

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WHAT ARE FUNCTION OF HEART?

✱The heart has four chambers: two atria and two ventricles.

✱ )The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle.

✱ )The right ventricle pumps the oxygen-poor blood to the lungs.

✱ )The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.

✱ )The left ventricle pumps the oxygen-rich blood to the body.

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IMPORTANCE OF DOUBLE CIRCULATION :-

✱ The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.

✱ Double circulatory systems are important because they ensure that we are giving our tissues and muscles blood full of oxygen, instead of a mixture of oxygenated and deoxygenated blood. While it may take a bit more energy than a single circulatory system, this system is much more efficient.

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Answer 2

Here is yours answer.....~

●Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium. Of course, the heart is also a muscle, so it needs a fresh supply of oxygen and nutrients, too, Phillips said. The cardiovascular system circulates blood from the heart to the lungs and around the body via blood vessels.

●During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.

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