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Q.
Spiral valve is present in:
Punjab PMETPunjab PMET 2003
Solution:
Spiral valve is present in truncus arteriosis of amphibian heart guiding flow of different types of blood in the aortic arches. According to recent thinking amphibian heart (3 chambered) pumps mixed blood to all the parts of the body. Besides, spiral valve is also found in the intestine of dog fish.