Disorders of Micturition Practice Test

The detrusor muscle is classified as smooth muscle. This type of muscle is involuntary, meaning it operates without conscious control. The detrusor muscle lines the bladder and is responsible for the contraction that occurs during micturition, allowing urine to be expelled from the bladder. Smooth muscle is characterized by its non-striated appearance and is primarily found in hollow organs, including the bladder, intestines, and blood vessels. This organization allows for the rhythmic contractions necessary for functions like urination and digestion, which are not subject to voluntary control. The other classifications, such as cardiac muscle (found in the heart), skeletal muscle (which is striated and under voluntary control), and voluntary muscle (which includes skeletal muscle), do not accurately describe the detrusor muscle, as it is specifically smooth and involuntary.