Answer:
The rapid rise and fall in force produced by a muscle fiber after a single action potential is called a muscle twitch. A muscle twitch is a type of muscular contraction that is produced in response to a single action potential, and it is characterized by a rapid and brief increase in muscle force followed by a rapid relaxation. This type of contraction is important for a variety of physiological processes, including reflexes, movements of the eyes and limbs, and maintenance of posture.