What term describes a blood vessel that is open and clear?

The term that describes a blood vessel that is open and clear is "patent." This term is used in medical contexts to indicate that the vessel is unobstructed, allowing for normal blood flow. When a blood vessel is patent, it means there are no blockages, and it retains its structural integrity to permit the proper circulation of blood. Understanding this term is important for combat medics and healthcare providers as it directly relates to various assessments and interventions regarding blood circulation and vascular health.

In contrast, terms like "obstructed," "collapsed," and "constricted" all imply some level of impairment or blockage. An obstructed vessel has some material or condition restricting blood flow, a collapsed vessel lacks sufficient pressure or structural support, and a constricted vessel has narrowed pathways, all of which differ from the state of being patent.