Final answer:
Smooth muscle is the type of muscle that is not composed of striated muscle.
Step-by-step explanation:
The muscle that is not composed of striated muscle is the smooth muscle. Smooth muscles are found in organs like the uterus and function involuntarily, meaning they are not under conscious control. On the other hand, the quadriceps, triceps, and gastrocnemius are all composed of striated muscle, which is characterized by its striped appearance.