Across
- 5. neurons another name for motor nerves
- 9. when muscles extend out,such as arms and legs
- 11. carries impulses from the organs to the brain
- 13. back of the arm
- 14. muscles on the little finger side of the hand
- 16. front of the arm
- 17. causes the corners of the mouth to frown
- 21. how much does the human heart weigh
- 22. system another word for the circulatory system
Down
- 1. amount of muscles in the human body
- 2. how much the body weight muscle accounts for
- 3. muscle used to nod the head
- 4. covers, shapes,a holds the skeletal system
- 6. muscles that draw fingers together
- 7. openings and closings for blood flow
- 8. when muscles turn inward
- 10. another word for nerve cell
- 12. when muscles rotate
- 15. muscles on the thumb side of the hand
- 18. bends the foot down
- 19. an automatic action
- 20. muscles that separate the fingers