Which medical term refers specifically to a speedy physiological process?

The term that refers specifically to a speedy physiological process is "tachy-." This prefix originates from the Greek word "tachys," meaning swift or fast. In medical terminology, "tachy-" is often used to describe rapid conditions, such as tachycardia, which refers to an abnormally fast heart rate.

In contrast, the other terms have different meanings. "Brady-" refers to a slow or decreased physiological process, such as bradycardia, which is a slower than normal heart rate. "Normo-" denotes a normal or usual state, often used in contexts where a baseline or standard measure is referenced. Lastly, "hypo-" describes lower than normal levels, as seen in hypoactivity or hypotension, which indicates low activity levels or low blood pressure respectively. Therefore, "tachy-" is the correct choice for indicating a speedy physiological process.