Essentials of Human Anatomy & Physiology

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Across
  1. 2. Pigment that gives skin its color
  2. 10. An atom that has gained or lost an electron
  3. 12. Skeleton portion that includes skull vertebral column and thorax
  4. 14. Bone cell that breaks down bone tissue
  5. 15. Tough protein in skin hair and nails
  6. 16. Main muscle for breathing
  7. 17. Biological catalyst
  8. 19. Freely movable joint cavity filled with fluid
  9. 20. Chemical messenger secreted by endocrine glands
  10. 21. Basic structural and functional unit of the nervous system
  11. 22. Movement of molecules from high to low concentration
  12. 24. Female reproductive cell
  13. 26. Diffusion of water across a membrane
  14. 27. Tube that carries urine from kidney to bladder
  15. 29. Male reproductive cell
  16. 31. Fluid portion of blood
Down
  1. 1. Hormone that lowers blood glucose levels
  2. 3. Functional unit of the kidney
  3. 4. Red blood cell
  4. 5. Functional unit of a muscle fiber
  5. 6. Oxygen-carrying protein in red blood cells
  6. 7. Wave-like muscle contractions in digestive tract
  7. 8. Fingerlike projections in small intestine that increase absorption
  8. 9. Air sacs in the lungs where gas exchange occurs
  9. 11. Brain region responsible for balance and coordination
  10. 12. Smallest unit of matter
  11. 13. Neurotransmitter released at neuromuscular junctions
  12. 18. Organelle known as the powerhouse of the cell
  13. 23. Fertilized egg
  14. 25. Maintenance of internal balance in the body
  15. 28. Mechanism used to maintain homeostasis
  16. 30. Tissue that lines body surfaces and cavities