The human body

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Across
  1. 5. or gastrointestinal system
  2. 6. body fluid in the circulatory system of humans
  3. 7. the endocrine, lymphatic and urinary systems ascend into this system
  4. 8. an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animal
Down
  1. 1. important part of the urinary system
  2. 2. chemicals that coordinate different functions in human body
  3. 3. group of passageways and organs extracts oxygen from air
  4. 4. system that supplies your body's organs with oxygen and nutrients so your organs can do their jobs