Final answer:
The human body has three types of muscles: skeletal muscle, which is voluntary and striated; smooth muscle, which is involuntary and not striated; and cardiac muscle, which is involuntary, striated, and only found in the heart.
Step-by-step explanation:
The human body contains three distinct types of muscle tissue: skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscle is characterized by long, cylindrical cells with multiple nuclei pushed to the periphery, and is under voluntary control. It is responsible for body movement and is striated due to the regular, parallel arrangement of contractile proteins.
Smooth muscle, found in internal organs, has spindle-shaped cells with a single central nucleus, and is not striated because its cells form sheets rather than bundles. This type of muscle is under involuntary control and sustains longer contractions. Lastly, cardiac muscle, exclusive to the heart, also demonstrates striations, has one to two nuclei per cell, and is made of branched fibers connected at intercalated discs. It contracts as a single unit called a syncytium and operates under involuntary control.