Jul 20, 2011

Vertebrate Blood Circulatory System

The vertebrate circulatory system became modified in the course of evolution as the site of the gas exchange changed from gills to lungs and as vertebrate became active and endothermic animals. The vertebrate heart has one or two atria, chambers that receive blood returning from the tissues, and a single or divided ventricle that pumps blood into the arteries. Additional chambers are present in some classes.

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