Crossword of doom (and bad headaches)

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Across
  1. 4. digests food by temporarily storing it, mixing it, and breaking it down with acid and enzymes
  2. 8. The process of taking in substances such as nutrients or chemicals into cells or tissues.
  3. 9. nerve cell that sends and receives electrical signals in the nervous system.
  4. 10. tissue.
  5. 11. A type of tissue that covers body surfaces, lines organs, and forms protective barriers; also
  6. 15. down food and absorb nutrients like vitamins, minerals, carbohydrates, and proteins
  7. 17. gas exchange, taking in oxygen from the air you breathe and transferring it to your bloodstream, while removing carbon dioxide, a waste product, from your blood
Down
  1. 1. absorb water and electrolytes, form and store feces, and produce and absorb vitamins like vitamin K
  2. 2. Tissue that contracts and relaxes to produce movement; includes skeletal, smooth, and cardiac
  3. 3. as the body's command center, controlling all functions, from involuntary actions like breathing to complex thought processes like memory and decision-making
  4. 5. Tissue that supports, connects, or separates other tissues and organs; contains an extracellular
  5. 6. as a pump to continuously send oxygen-rich blood throughout your body
  6. 7. Matrix (ECM): A network of nonliving material, such as proteins and fibers, that supports and surrounds cells in
  7. 12. in absorption, secretion, and sensation.
  8. 13. The release of useful substances produced by cells or glands.
  9. 14. The removal of waste products from the body.
  10. 16. Tissue that receives and sends electrical signals; makes up the brain, spinal cord, and nerves.