1) NERVOUS SYSTEM a) TO SEND MESSAGES FROM VARIOUS PARTS OF YOUR BODY TO YOUR BRAIN b) to release hormones into your bloodstream 2) ENDOCRINE SYSTEM a) to release hormones into your bloodstream b) to move fresh air into your body w 3) RESPIRATORY SYSTEM a) to move fresh air into your body while removing waste gases  b) Muscles are attached to bones or internal organs ,blood vessels are responsible of movement. 4) MUSCULAR SYSTEM a) Muscles are attached to bones or internal organs ,blood vessels are responsible of movement. b) to move fresh air into your body while removing waste gases

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