Final answer:
The correct histological characteristic of cardiac muscle is the presence of visible striations and a single, centrally-located nucleus.
Step-by-step explanation:
The statement that describes histological characteristics of cardiac muscle is A. Presence of visible striations & single, centrally-located nuclei. Cardiac muscle, known as cardiomyocytes, exhibits striations due to the regular arrangement of actin and myosin proteins in sarcomeres.
These cells are typically shorter than skeletal muscle cells and have a smaller diameter. They also contain a single, centrally-located nucleus, but sometimes two or more can be found. In addition, cardiac muscle cells are equipped with numerous mitochondria, T tubules at the Z discs for transmitting impulses, and intercalated discs that support synchronization of the heartbeat.