The human body2

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Across
  1. 3. The heart chamber in which the blood arrives from the body.
  2. 5. The involuntary muscle of the heart.
  3. 8. Carry blood back to the heart.
  4. 9. Structure of the skin that allows us to feel things.
  5. 11. The "door" that leads to the lungs.
  6. 16. The voluntary muscles of the body.
  7. 18. The "door" that leads to the aorta.
  8. 19. Carry blood away from the heart.
  9. 20. Skin, hair, nails and some glands.
  10. 21. gland Structure of the skin that helps to regulate temperature.
  11. 22. The second level of organization of the human body.
Down
  1. 1. The third level of organization of the human body.
  2. 2. Produces red blood cells, white blood cells, and platelets.
  3. 4. The skull, vertebrate column, ribs, and sternum.
  4. 6. Another name for blood type O.
  5. 7. The blood flows from the right ventricle to the ...
  6. 10. The involuntary muscles surrounding hollow organs.
  7. 12. The shoulders, arms, hands, hips, legs, and feet.
  8. 13. Group of organs working together.
  9. 14. Give substances to cells and take away waste.
  10. 15. The most inner layer of the skin; contains fatty tissue.
  11. 17. Form blood clots to repair a hurt blood vessel.