Final answer:
Sharp transient first pain is carried by myelinated A-delta fibers, which are fast-conducting nerve fibers transmitting sensory information quickly, resulting in the sensation of fast pain.
Step-by-step explanation:
The sharp transient first pain you are referring to is typically carried by A-delta fibers. These are myelinated nerve fibers that are responsible for transmitting sensory information quickly to the central nervous system. The characteristic of the pain carried by A-delta fibers can be described as sharp because these fibers have a relatively fast conduction velocity, allowing them to relay information rapidly, which is why this type of pain can also be referred to as fast pain. It's in contrast to the dull, throbbing pain known as second pain that is transmitted by slower, unmyelinated C fibers.