Correct option is C
Correct Answer: (C) Fish
Explanation:
Fish possess a two-chambered heart, consisting of one atrium and one ventricle. In fish, the heart pumps deoxygenated blood to the gills for oxygenation. The oxygenated blood then directly circulates to the rest of the body before returning to the heart, constituting a single circulation system. This means blood passes through the heart only once during each complete circuit of the body.
In contrast, amphibians (e.g., frogs) and most reptiles (e.g., snakes) have a three-chambered heart with two atria and one ventricle. This configuration allows for a form of double circulation, where oxygenated and deoxygenated blood are partially separated, enabling blood to pass through the heart twice during each circuit—once to the lungs (or skin/gills) and once to the rest of the body.
Birds (e.g., eagles) and mammals possess a four-chambered heart with two atria and two ventricles, facilitating complete separation of oxygenated and deoxygenated blood and efficient double circulation.
Information Booster:
- Single Circulation: Blood passes through the heart once per complete circuit (e.g., in fish).
- Double Circulation: Blood passes through the heart twice per complete circuit, involving separate pulmonary and systemic circuits (e.g., in amphibians, reptiles, birds, and mammals).
- Heart Chambers:
- Fish: Two chambers (one atrium, one ventricle).
- Amphibians and Most Reptiles: Three chambers (two atria, one ventricle).
- Birds and Mammals: Four chambers (two atria, two ventricles).
- Circulatory Efficiency: Double circulation allows for higher blood pressure and more efficient oxygen delivery, supporting higher metabolic activities.
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