what is double circulation and how it is act on human beings??..
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Anupamasrimaa:
but...how it act on human being???...
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ok...its fine...thanks...for your help
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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 isoxygenated, 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!
Some Basic Heart Anatomy
The organ that powers the circulatory system is the heart. The human heart pumps blood through four chambers: two atria and two ventricles. We also havefour valves in our hearts that keep blood moving in one direction, preventing backflow back into the heart; two valves are found within the heart itself and two are found in the major arteries in the heart: theaorta and the pulmonary artery.

Humans have a 4-chambered heart (some organisms have only two or three chambers in their hearts; these animals are typically reptiles and fish), and we separate the heart into right and left halves. Each half of a human heart has one atrium, which sits 'on top' of one ventricle. The right and left halves of the heart are separated by a layer of muscle tissue called the septum. Keep in mind that when you look at a picture of a heart, it is shown how the heart would sit in your chest, so everything looks backwards.
There are two types of valves in the heart. The first set of valves are theatrioventricular valves that separate the atria from the ventricles. The tricuspid valve is the valve on the right side of the heart, and the bicuspid or mitral valve is the valve on the left side of the heart. The second set of valves are the semilunar valves that are found at the base of the aorta and the pulmonary artery. When you listen to your heart beat and you hear that 'lup-dub' sound, what you're hearing is the sound of these valves closing!
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!
Some Basic Heart Anatomy
The organ that powers the circulatory system is the heart. The human heart pumps blood through four chambers: two atria and two ventricles. We also havefour valves in our hearts that keep blood moving in one direction, preventing backflow back into the heart; two valves are found within the heart itself and two are found in the major arteries in the heart: theaorta and the pulmonary artery.

Humans have a 4-chambered heart (some organisms have only two or three chambers in their hearts; these animals are typically reptiles and fish), and we separate the heart into right and left halves. Each half of a human heart has one atrium, which sits 'on top' of one ventricle. The right and left halves of the heart are separated by a layer of muscle tissue called the septum. Keep in mind that when you look at a picture of a heart, it is shown how the heart would sit in your chest, so everything looks backwards.
There are two types of valves in the heart. The first set of valves are theatrioventricular valves that separate the atria from the ventricles. The tricuspid valve is the valve on the right side of the heart, and the bicuspid or mitral valve is the valve on the left side of the heart. The second set of valves are the semilunar valves that are found at the base of the aorta and the pulmonary artery. When you listen to your heart beat and you hear that 'lup-dub' sound, what you're hearing is the sound of these valves closing!
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