Matching Pairs Human Body Relative SystemsOnline version Body Systems by John Schubert 1 2 This system sends messages to the brain 3 4 This body system is designed to fight infectious diseases 5 6 This body system helps get liquid waste out of the body. 7 8 This system sends hormones and messages from the brain Endocrine System Nervous System Nervous System Picture Urinary System Picture Urinary System Endocrine System Picture Immune System Picture Immune System