Which type of muscle is responsible for one organ only and functions involuntarily?

The type of muscle responsible for one organ only and that functions involuntarily is cardiac muscle. This specialized muscle tissue is found only in the heart, where it plays a crucial role in pumping blood throughout the body. Cardiac muscle is unique in that it contracts independently of conscious control, which is essential for maintaining the heart's rhythm and ensuring continuous blood circulation.

Cardiac muscle cells are interconnected by intercalated discs, allowing for synchronized contractions, which is vital for effective heart function. This involuntary nature distinguishes it from skeletal muscle, which is under voluntary control, and allows it to sustain continuous activity without tiring, as required by the heart.

Skeletal muscle, on the other hand, is attached to bones and is responsible for voluntary movements within the body. Striated muscle is a term that generally refers to muscles with a banded appearance, including both skeletal and cardiac, but it does not specifically indicate involuntary function within a single organ. Voluntary muscle refers specifically to those muscles that can be consciously controlled, which again excludes the involuntary nature of cardiac muscle.