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B9 (B9.1, B9.4, B9.2, B6.5, B9.3) - Coggle Diagram

- - - - Involves skeletal muscles, e.g,. raising hand to answer question)
    - - involves smooth muscles, cardiac muscles or glands and skeletal muscles (e.g., knee jerk)
- - - - retracts light
    - - Controls how much light enters pupril
    - - focuses light onto retina
    - - contains light receptors, some sensitive to light of different colors
    - - carries impulses to brain
    - - contracts and relaxes focus on near or distant objects
  - - - Size of pupil determine how much light enters eye
        
        Large in dim light
        
        circular muscles of iris relax, radial muscles contract, widening pupil to allow more light
        
        Small in bright light
        
        Radial muscles relax, circular muscles contract to narrow the pupil to reduce amount of light entering
- - - - increasing blood glucose concentration
      - Pulse rate
      - fast breathing