In fishes, the heart pumps:
Correct answer: D. Impure blood to gills
- A. Pure blood to body
- B. Impure blood to body
- C. Pure blood to gills
- D. Impure blood to gills
Explanation
In fishes, the heart pumps out deoxygenated blood from the body to the gills where it gets oxygenated. The correct answer is 'Impure blood to gills' because fishes have a two-circuit circulatory system that carries deoxygenated blood to the gills for oxygenation before returning it to the body.The other options are incorrect because fishes do not pump pure blood to the body or pure blood to the gills in their circulatory system.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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