| Name: | bulbus arteriosus | 
|---|---|
| Synonyms: | cardiac outflow tract, outflow tract, truncus | 
| Definition: | Multi-tissue structure that consists of three layers and through which the blood exits the heart. The bulbus arteriosus is a pear shaped chamber that functions as a capacitor, maintaining continuous blood flow into the gill arches. | 
| Ontology: | Anatomy Ontology [ZFA:0000173] | 
| Name: | smooth muscle | 
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| Synonyms: | |
| Definition: | A non-striated muscle that is composed of spindle-shaped cells. Smooth muscle usually is organized into sheets that line cavitated organs. | 
| Ontology: | Anatomy Ontology [ZFA:0005274] |