| Name: | sinus venosus |
|---|---|
| Synonyms: | inflow tract |
| Definition: | Heart region collecting blood from the paired common cardinal veins and delivering to the atrium. One of four components of the heart. The sinus venosus also acts as a pacemaker and is the first to contract. |
| Ontology: | Anatomy Ontology [ZFA:0000154] |
| Name: | muscle |
|---|---|
| Synonyms: | muscles |
| Definition: | Portion of tissue composed of contractile fibers. |
| Ontology: | Anatomy Ontology [ZFA:0005145] |