The only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the - fishes or Pisces
The single circulation system is a type of circulatory system in which the blood passes only once through the heart in complete one circuit of the body.
- the blood will pass through the heart to gills and then be distributed to different parts of the body after purification.
- Oxygenated blood will not return to the heart.
- Takes place in an organism with a two-chamber heart, Atria (Auricle) and Ventricle are two chambers of the heart.
- Fishes (Pisces) have the simplest circulatory systems of the vertebrates as they show a single circulation system.
Thus, the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the - fishes or Pisces.
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