The statement that best describes how the body moves is: skeletal muscles, which are made of fibers, nerves, and blood vessels, contract in order to make the body move.
Skeletal muscles are responsible for voluntary movements and are attached to bones by tendons. When the brain sends signals through the nerves to these muscles, they contract and shorten, pulling on the bones and thereby causing movement. The muscle fibers within skeletal muscles are specialized for contraction, allowing for quick and powerful movements.
In contrast, cardiac and smooth muscles, while also important, have different functions and are not under voluntary control. Cardiac muscle makes up the heart and pumps blood, while smooth muscle is found in places like the walls of blood vessels and the digestive tract, helping to move substances through those systems. Unlike skeletal muscles, these types of muscles work automatically and are regulated by the autonomic nervous system.