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Text File  |  1992-09-03  |  265b  |  9 lines
  1. An iris in anatomy, is the coloured muscular 
  2. diaphragm that controls the size of the pupil 
  3. in the vertebrate eye. It contains radial 
  4. muscle that increases the pupil diameter and 
  5. circular muscle that constricts the pupil 
  6. diameter.  
  7.  
  8. Subject by: Scott Southall
  9.