The circulatory system of bony fish is characterized by which heart structure?

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Multiple Choice

The circulatory system of bony fish is characterized by which heart structure?

Explanation:
The key idea is that bony fish have a two-chambered heart, consisting of an atrium and a ventricle, arranged in a single circulatory loop. Blood returning from the body enters the atrium via the sinus venosus, moves to the ventricle, and is pumped to the gills for oxygenation, then circulating to the rest of the body. Because the heart has only two chambers, there isn’t a full separation of oxygen-rich and oxygen-poor blood within the heart, and the circulation operates as a single circuit with relatively lower pressure. This matches the two-chambered heart description. A three-chambered heart belongs to amphibians and some reptiles, a four-chambered heart is found in birds and mammals, and there is no heart in the listed sense for that option.

The key idea is that bony fish have a two-chambered heart, consisting of an atrium and a ventricle, arranged in a single circulatory loop. Blood returning from the body enters the atrium via the sinus venosus, moves to the ventricle, and is pumped to the gills for oxygenation, then circulating to the rest of the body. Because the heart has only two chambers, there isn’t a full separation of oxygen-rich and oxygen-poor blood within the heart, and the circulation operates as a single circuit with relatively lower pressure.

This matches the two-chambered heart description. A three-chambered heart belongs to amphibians and some reptiles, a four-chambered heart is found in birds and mammals, and there is no heart in the listed sense for that option.

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