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Preeti Dabral 4 years, 2 months ago
The heart of fish has two chambers. This means there is no separate circulation for oxygenated and deoxygenated blood. There is separation of two chambers in the atrium of amphibians. This has further evolved for partial separation of ventricle as well in reptiles. Finally in birds there is complete separation of oxygenated and deoxygenated blood circulation due to advent of four chambers in the heart. Mammal heart is the most developed having the most efficient double circulatory system with four chambers and separation of two blood streams.

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Preeti Dabral 4 years, 2 months ago
Blood is considered on a connective tissue because it contains plasma and the form ed elem ents such as RBCs, WBCs (leucocytes), blood platelets etc.
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Preeti Dabral 4 years, 2 months ago
The fish heart is called the venous heart because it only receives blood from the veins and pumps it for oxygenation straight to the gills. In the fish heart, blood travels through a single complete circuit once only. Blood flows into the atrium after passing through the fish leaving it poorly oxygenated.
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Preeti Dabral 4 years, 2 months ago
Serum is plasma without the clotting factors. Red blood cells account for approximately 45% of the whole blood, white blood cells and platelets approximately 1%, and serum or plasma accounts for the remainder, approximately 55% of the volume
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Ashok Kumar 4 years, 2 months ago
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