What type of muscle exhibits involuntary control and is found in the walls of hollow organs?

Smooth muscle is the type of muscle that exhibits involuntary control and is found in the walls of hollow organs such as the intestines, blood vessels, and the bladder. This muscle type functions automatically and is not under conscious control, making it essential for processes such as digestion, blood circulation, and regulation of organ volumes.

Smooth muscle fibers are spindle-shaped, non-striated, and often arranged in sheets, which allows for coordinated contractions that facilitate the movement of substances through the organs. The involuntary nature of smooth muscle is crucial; it ensures that vital functions can continue without conscious thought or effort, unlike skeletal muscle, which is under voluntary control and typically associated with movement of the skeleton.

Thus, the unique characteristics of smooth muscle, including its involuntary control and location in hollow organs, clearly support its classification in this context.