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Muscle (p&a r - 5.1.5 L) - Coggle Diagram

- - - - Many nuclei
      - Cell surface membrane called sarcolemma
      - Cytoplasm called sarcoplasm
      - Contains many mitochondria
      - Expansive sarcoplasmic reticulum
    - - Single fibre made up of many myofibrils
      - They are the contractile elements
      - 1 functional unit of muscle is called a sarcomere
      - Sarcomeres contain the protein filaments Actin (thin) & Myosin (thick)
      - Under microscope myofibrils show banding patterns or striations
        
        Dark regions, light regions & intermediate regions
        
        Vertical lines also seen
        
        Need higher magnification to see reasons for these patterns
- - - - Controls intensity of light entering eye
      - Contraction of radials dilatespupil
      - Contraction of circulars contract the pupil
  - - - Regulates local blood pressure
      - Temperature
      - Redirects blood flow to voluntary muscles during exercise