Final answer:
The cardiac muscle is involuntary, striated with short, branched cells that have a single nucleus, and is specifically found in the heart, equipped with intercalated discs for electrical conductivity.
Step-by-step explanation:
The type of tissue that is characterized as involuntary, striated with short, branched cells containing a single nucleus is cardiac muscle. Unlike smooth muscle, which is involuntary, non-striated, and spindle-shaped, and skeletal muscle, which is under voluntary control and has long, cylindrical, multinucleated cells, cardiac muscle is unique to the heart. It is also known for having special junctions called intercalated discs, which help to quickly spread the electrical signal necessary for contraction throughout the heart. This allows the heart to function effectively as a pump.