Assertion: circulatory system's heart | /r/HasAspect | two atria
Facets:
Source sentences:
text: The heart has two ventricles and two atria.
text: As seen in the diagram, the human heart has two atria and two ventricles.
text: The avian heart has two atria and two ventricles (four chambers), as is found in mammals.
text: Amphibians have a three-chambered heart that has two atria and one ventricle rather than the two-chambered heart of fish (figure b).