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In which animal the heart pumps out only...

In which animal the heart pumps out only deoxygenated blood?

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Fishes
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Read the following statements carefully (i) In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body part from where deoxygenated blood is returned to the heart (ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves (iii) The nodal musculature has the ability to generate action potential without any external stimuli, i,e., it is autoexcitable (iv) The T-wave of ECG represent depolarisation of the ventricles. Which of the above two statements are incorrect ?

Draw the diagram of sectional view of human heart and on it name and label the following parts: (a) The chamber of the heart that pumps out deoxygenated blood. (b) The blood vessel that carries away oxygenated blood from the heart. (c ) The blood vessel that receives deoxygenated blood from the lower part of our body.

Assertion : The heart of fish contains only deoxygenated blood. Reasoning : Oxygenated blood does not return back to the heart in fishes.

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. Which chambers of human heart contain oxygenated blood?