Smooth muscle tissue is primarily found in the walls of which organs?

Smooth muscle tissue is primarily found in the walls of internal organs, which include structures such as the gastrointestinal tract, blood vessels, bladder, and uterus. This type of muscle is involuntary, meaning it operates without conscious control, and it is responsible for facilitating various autonomic functions such as digestion and regulating blood flow.

By contrast, cardiac organs contain cardiac muscle, which is specialized for the heart, while skeletal muscles are voluntary and attached to bones, allowing for movement. Circulatory organs, although they involve the heart and blood vessels, do not encompass the broader range of internal organs where smooth muscle is primarily located. Hence, the identification of smooth muscle tissue as being predominantly in the walls of internal organs accurately reflects its biological function and anatomical positioning.