Lesson 23 Crossword

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Across
  1. 3. - the outermost layer of the skin
  2. 4. - digests food and rids your body of toxic substances
  3. 5. - the basic physical and functional unit of heredity
  4. 7. - is a structural frame that supports a human body
  5. 9. - the 33 individual bones that interlock with each other to form the spinal column
  6. 10. - it is the starting point of the digestive system
  7. 13. - a pair of spongy, air-filled organs located on either side of the chest
  8. 16. - is known as the large bowel or large intestine
  9. 17. cord - A column of nerve tissue that runs from the base of the skull down the center of the back
  10. 19. - the largest organ of the body
  11. 21. - a soft fatty substance in the cavities of bones
  12. 22. - the largest part of blood; stores blood
  13. 24. - an organ in the human body which secretes particular chemical substances for use in the body
Down
  1. 1. - a thin tube in your lower right abdomen; it sits where the large intestine meets the small intestine
  2. 2. - a cable-like structure in the body that relays information from one part of the body to another
  3. 4. - a fibrous connective tissue which attaches bone to bone
  4. 6. - a hollow, muscular tube that connects the throat to the stomach
  5. 8. - blood vessels that carry blood low in oxygen from the body back to the heart
  6. 11. - a fibrous connective tissue which attaches muscle to bone
  7. 12. - a band or bundle of fibrous tissue in a human body that has the ability to contract, producing movement in or maintaining the position of parts of the body
  8. 14. - a bony structure that supports the face and forms a protective cavity for the brain
  9. 15. - lumps of tissue at the back of the throat
  10. 18. - the blood vessels that deliver oxygen-rich blood from the heart
  11. 20. - the blood circulating through the body of a person
  12. 23. - a special filter system for your body