Final answer:
A primary suture line created with a single strand of suture placed as a series of stitches without tying off after each stitch is called a running suture or continuous suture. It is commonly used for quickly closing surgical incisions or wounds.
Step-by-step explanation:
A primary suture line consisting of a single strand of suture placed as a series of stitches is called a running suture. This is also commonly referred to as a continuous suture. It is one of the most common techniques used in closing surgical incisions or wounds. It involves the needle being passed in and out of the tissue at regular intervals, creating a line of suture material that runs continuously. Unlike interrupted sutures, which are placed individually and each tied off separately, a running suture does not need to be tied after each pass, therefore it's faster to place and often used in situations where quick closure is necessary. On the other hand, mattress sutures are placed very differently and are designed to evert the wound edges.
Answer: 1) Continuous suture