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From Self-sufficiency
- ...some [[invertebrate]] groups have an open cardiovascular system. The most primitive animal [[phylum|phyla]] lack circulatory systems. The lymphatic system, on ...ns return the now oxygen-rich blood to the heart, where it enters the left atrium before flowing through the [[mitral valve]] into the left ventricle. Then,22 KB (3,037 words) - 21:25, 21 September 2010
- Precursor = [[primitive ventricle]], [[bulbus cordis]] | ...receives [[Oxygenation_(medical)|deoxygen]]ated [[blood]] from the [[right atrium]] via the [[tricuspid valve]], and pumps it into the [[pulmonary artery]] v3 KB (357 words) - 21:28, 21 September 2010
- * [[Primitive atrium]]5 KB (817 words) - 21:28, 21 September 2010
- | group1 = [[Primitive heart tube]] ...]]{{·}} [[Bulbus cordis]]{{·}} [[Primitive ventricle]]{{·}} [[Primitive atrium]]{{·}} [[Sinus venosus]]2 KB (210 words) - 21:29, 21 September 2010