Study the following information...specially their function for example I can see with my eyes. I use my stomach to digest food . I use my heart to pump blood. I use my brain to think. I use my skeletal system to hold my body. I use my lungs to breath. You can find more information here http://www.interschool.edu.sv/documents/vocabulario/VOCABULARY%20FIRST%20PERIOD%202016-17%20PREPA.pdf Only in the vocabulary section !