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