Blood Crossword

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Across
  1. 4. the liquid matrix that blood cells are suspended in
  2. 5. proteins that recognize certain molecules
  3. 6. produced in the red bone marrow
  4. 7. transport oxygen to the body's cells
Down
  1. 1. function in blood clotting
  2. 2. fight infection and are a major part of the immune system
  3. 3. a toxin or other foreign substance which induces an immune response in the body