Final answer:
Lumen describes the interior space of a tubular structure like a blood vessel, not a unit of measurement. For measuring volumes in a lab, apparatus like graduated cylinders, burettes, pipettes, and volumetric flasks are used. None of the options provided measure the lumen.
Step-by-step explanation:
The term lumen refers to the interior of a tubular structure through which substances travel, such as in the circulatory system or the gastrointestinal tract. It is not directly related to measurements of capacity or volume. For those kinds of measurements, graduated glassware like a graduated cylinder, burette, pipette, or volumetric flask is used. These tools are imperative in a laboratory setting, especially for tasks like titrations, where precision is crucial. None of the options given (cannula, gauge, pestle, hub, barrel) are a measurement of the lumen. They are parts or types of various tools or devices related to different fields such as medicine and engineering.