Body Systems Crossword

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 3. That part of the central nervous system that includes all the higher nervous centers (5)
  2. 5. Any chamber that is connected to other chambers or passageways (6)
  3. 7. Rigid connective tissue that makes up the skeleton of vertebrates (plural) (5)
  4. 8. The outer layer of the skin covering the exterior body surface of vertebrates (9)
  5. 9. Red liquid pumped around the body by the heart (5)
  6. 11. A ___ that contracts without conscious control and found in walls of internal organs such (12)
  7. 13. The longest and thickest bone of the human skeleton (5)
  8. 14. Either of two saclike respiratory organs in the chest of vertebrates (plural) (5)
  9. 15. Either of two large veins that return oxygen-depleted blood to the right atrium of the heart (8)
  10. 16. Either of two bean-shaped excretory organs that filter wastes from the blood and excrete them (6)

Down

  1. 1. A natural protective body covering and site of the sense of touch (4)
  2. 2. Tough elastic tissue (9)
  3. 4. Any substance that promotes ___ (9)
  4. 6. A chamber of the heart that receives blood from an atrium and pumps it to the arteries (9)
  5. 10. Of or relating to or near the part of the back between the ribs and the hipbones (6)
  6. 12. One of the contractile organs of the body (6)