Which of the following statements is true? 1.the organ system is the lowest level in the hierarchy. 2.organ systems are less complex than the organs they are made from. 3.the success of a system depends on the proper function of its parts. 4.the muscular system does not need the skeletal system to move the body.

The correct answer is the 3rd option. The success of a system depends on the proper function of its parts. FACT

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.