Please discribe the process of blood circulation in fish?

The circulatory system of fish includes heart, blood and blood vessels. Heart is located between the posterior gill arches. It is enclosed by the pericardial membrane. The important chambers of heart includes atrium, a ventricle, a sac-like thin-walled structure called sinus venosus and a tube called bulbus arteriosus. 
Their blood contains plasma, red blood cells that contain hemoglobin and white blood cells. The thrombocytes perform the functions that is equivalent to the function of platelets in the human body. Blood is circulated throughout the body with the help of blood vessels. The arteries are responsible for carrying oxygenated blood from the heart to the rest of the body, while the veins are responsible for carrying deoxygenated blood from the different parts of the body to the heart. Deoxygenated blood first enters the atrium of the heart. Then it enters the ventricle, from where it is pumped into the tube, bulbus arteriosus. The blood reaches the aorta and then to gills through bulbus arteriosus where oxygenation of blood take place. Then the oxygenated blood is transported throughout the body with the help of blood vessels.

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