how many component of fish heart?
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In most fish, the heart consists of four parts, including two chambers and an entrance and exit. The first part is the sinus venosus, a thin-walled sac that collects blood from the fish's veins before allowing it to flow to the second part, the atrium, which is a large muscular chamber.
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In most fish, the heart consists of four parts, including two chambers and an entrance and exit....
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