What is the name of the involuntary muscle tissue found in the heart?

The correct answer is the name of the involuntary muscle tissue found in the heart, which is cardiac muscle. Cardiac muscle is specialized for the continuous, rhythmic contractions necessary for maintaining blood circulation throughout the body. Unlike voluntary muscles, which are under conscious control, cardiac muscle functions automatically and is characterized by its striated appearance and intercalated discs that facilitate synchronized contractions.

Visceral muscle refers to smooth muscle found in the walls of hollow organs such as the intestines and blood vessels; while it is also involuntary, it is not the type found in the heart. The terms antagonists refer to a pair of muscles that work against each other to facilitate movement rather than describing a specific muscle tissue type. The origin generally refers to the fixed attachment point of a muscle but does not describe a muscle tissue itself. Thus, the characteristics and functions of cardiac muscle uniquely identify it as the specific involuntary muscle tissue present in the heart.