Final answer:
There are three types of muscle in the body: smooth muscle, skeletal muscle, and cardiac muscle. Voluntary muscles are muscles that are under conscious control. Voluntary muscle fibers can be further classified into slow twitch fibers and fast twitch fibers.
Step-by-step explanation:
Voluntary muscles are muscles that are under conscious control. There are three types of muscle in the body: smooth muscle, skeletal muscle, and cardiac muscle. Smooth muscle is found within the walls of organs and structures, skeletal muscle is responsible for movement and can be finely controlled, and cardiac muscle is specific to the heart. Voluntary muscle fibers can be further classified into slow twitch fibers, which contract for long periods of time but with little force, and fast twitch fibers, which contract quickly and powerfully but fatigue rapidly.