The Closed Circulation System

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In phylum chordata, the circulatory system of each species are closed circulation. The closed circulation systems evolved in the phylum Echinodermata. However, with some enhancements, some species may have different numbers of chambers such as shark with 2 chambers, frog with 3 chambers and pig with 4 chambers. Some circulations have different shapes. In fish, they have most likely to have closed loop circulatory system. They have single circulation. In reptiles, they have double circulation. Their heart can move around because they lack of diaphragm. Lastly, the mammals have double circulation because it can pumps oxygenated and deoxygenated blood to the lungs. The function of circulatory system in closed loop is that blood travels through …show more content…
The septum act as the division of the sides of mammal’s heart. With the help of septum, it helps to control the rich and poor oxygenated blood to mix. These are the right and left side that contains the four chambers; right atrium and right ventricle for right side and the left contains the left atrium and left ventricles. The upper part which are the left and right atrium are the one receiving the blood meanwhile the lower chambers, the left and right ventricle, are the one that pumps the blood our of our heart as the heart contracted. On the right atrium, there is a part called superior vena cava that helps to bring the poor oxygenated blood form the upper part of our body as it travels to the right atrium. Then, from the lungs there are pulmonary veins that brings poor oxygenated blood to left atrium. Also our heart composed of valve called pulmonary valve to prevent our blood to flow back to our right ventricle as if went after it arrives from our pulmonary artery. There is another valve called tricuspid valve that prevents the poor oxygenated blood to flow back into our right atrium. The inferior vena cava is the part of our heart that brings poor oxygenated blood from our lower part of our body to travel to our right atrium. This is the opposite of the superior vena

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