Students list the functions of bones and the skeletal system and describe how joints aid movement.
Students also describe how muscles work with bones and contrast the functions of voluntary and involuntary muscles. Students then describe the function and some of the organs of the circulatory system, the nervous system, the respiratory system, and the digestive system. By the end of fourth grade, students will develop an understanding of form and function. Students make a model of muscle pairs to show how the leg and foot work together. The model shows how muscles in the calf shorten to move the foot up and down.