| Term: | atrium cardiac muscle cell | 
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| Note: | This page represents a term created by the combination ("post-composition") of two ontology terms. For more information on the individual terms, click the hyperlinked name. | 
| Name: | atrium | 
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| Synonyms: | |
| Definition: | Cavitated compound organ that receives inflow of deoxygenated blood and delivers it to a muscular cardiac ventricle. Valves are present to direct flow. There are only two chambers present in the fish heart. | 
| Ontology: | Anatomy Ontology [ZFA:0000471] | 
| Name: | cardiac muscle cell | 
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| Synonyms: | cardiac muscle cells, cardiac myocyte, cardiomyocyte | 
| Definition: | |
| Ontology: | Anatomy Ontology [ZFA:0009316] | 
