The heart of a fish acts as 'single circuit' where the blood from gills flows to:
Correct answer: D. Sinus venosus
- A. Atrium
- B. Dorsal aorta
- C. Ventral aorta
- D. Sinus venosus
Explanation
In the circulatory system of a fish, the heart operates in a single circuit, meaning that blood passes through it once per cycle. Blood from the gills, which is now oxygenated, flows to the sinus venosus, which is a chamber that collects blood before it enters the heart. The atrium receives blood returning from the rest of the body, the dorsal aorta distributes oxygenated blood to the body, and the ventral aorta transports deoxygenated blood from the heart to the gills for oxygenation. Therefore, the sinus venosus is the correct answer.
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