Which type of muscle tissue is involuntary and found in the walls of organs?

The correct answer is smooth muscle, which is characterized as involuntary muscle tissue found in the walls of various organs throughout the body. This type of muscle is essential for various bodily functions, such as digestion, blood vessel regulation, and the movement of food through the gastrointestinal tract. Unlike striated and cardiac muscle, which are both involuntary or voluntary and have distinct banding patterns, smooth muscle appears uniform and does not exhibit striations. Its contractions are controlled autonomously by the nervous system and hormones, allowing for involuntary movements necessary for the functioning of internal organs. This unique feature of smooth muscle makes it crucial for maintaining normal physiological processes in the body.