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