Final answer:
Smooth muscle tissue is characterized by cells that are long with pointed ends and contain a single nucleus. This type of muscle is found in the walls of blood vessels and the digestive tract and is responsible for involuntary movements.
Step-by-step explanation:
The type of muscular tissue described as being long with pointed ends and uninucleate refers to smooth muscle tissue. Smooth muscle cells, also known as myocytes, are indeed spindle-shaped and have a single, central nucleus. These cells are shorter compared to skeletal muscle cells and do not exhibit the striations that skeletal and cardiac muscle cells have. Smooth muscle is found in the walls of blood vessels and the digestive tract, playing a critical role in involuntary movements such as propelling food through the digestive system or regulating blood pressure by contracting and relaxing blood vessels.
Unlike smooth muscle, skeletal muscle cells are long, cylindrical, and multinucleated. They have multiple nuclei along the periphery of each cell and are responsible for voluntary movements as they are attached to the skeleton. Meanwhile, cardiac muscle tissue, which is also striated like skeletal muscle, typically contains one or two centrally located nuclei and is found exclusively in the heart, facilitating involuntary contractions that pump blood throughout the body.