A spiral valve or scroll valve is the corkscrew shaped lower portion of the intestine of some sharks, rays, skates, bichirs, and lungfishes. A modification of the ileum, the spiral valve is internally twisted or coiled to increase the surface area of the intestine, to increase nutrient absorption. The intestines of a shark are much shorter than th...
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http://en.wikipedia.org/wiki/Spiral_valve
(from the article `circulation`) ...heart receives blood from the body on the right side and from the lungs on the left. The conus is large and is divided by a complex system of ... ...intestine. For instance, special blind sacs, called ceca, branch from the anterior end of the small intestine in certain fishes and from the ... [2 re...
Found on
http://www.britannica.com/eb/a-z/s/141
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