Choose a system of the body and find a corresponding chart of that body system. For example, begin with one of the easier systems, such as the skeletal system. Find a chart of the skeletal system to hang on the chalkboard at the front of the room. Write the name on the board next to the chart to ensure that the children can begin associating the name with the system. Innerbody.com has images of the human body with labels that may help.
Sing the "Dem Bones" song to help the children engage with the skeleton inside the human body. A clip of the song and the song lyrics can be found on the songsforteaching.com website. Have the students listen to the song and then stand and act out the song as they are singing it, pointing to each bone that is mentioned in the song.
Have the students label a drawing of a skeleton with all of the basic names for the bones they have learned. Obviously the names will not be the scientific names, but this is a basic exercise to see if students can understand the general relationships between bones in the human body. Allow them to color the skeleton to promote fun learning.
Use white construction paper and scissors to cut out bone shapes. Have the students put the bones together like a puzzle, using clear tape to attach them. Have the students label each piece and what it connects to using markers or colored pencils. Hang the finished skeletons throughout the room during the learning of the skeletal system.
Repeat this process with the other body systems. Use charts, coloring worksheets, singalong songs and puzzle-like art projects to help students learn the different systems and their functions.