Final answer:
True, smooth muscle cells have a central nucleus and lack striations. They are found in various internal organs and operate under involuntary control.
Step-by-step explanation:
The statement that smooth muscle cells possess central nuclei but lack striations is true. Smooth muscle fiber cells are spindle-shaped and contain a single, centrally located nucleus. Unlike skeletal and cardiac muscle tissues, smooth muscles do not exhibit the banded appearance or striations because they lack the organized sarcomeres that give rise to these structures.
However, they do contain the contractile proteins actin and myosin. Smooth muscle is found in the walls of internal organs such as blood vessels and the digestive system and is under involuntary control, meaning it operates without conscious intent.