F  --  ISLETS OF LANGERHANS
   
29.   The Islets of Langerhans are scattered groups of coordinated cells
        (T I S S U E S)  located with an organ known as the  P A N C R E A S.
        As you guessed, they are named for their discoverer, Doctor
        L A N G E R H A N S.  While much of the pancreas produces enzymes
        for the D I G E S T I V E   system, the Islets of Langerhans produce
        two different  H O R M O N E S  for the endocrine system.

30.   One of the hormones of the Islets of Langerhans is  I N S U L I N . 
        This hormone converts excess G L U C O S E  into a complex starch
        (P O L Y S A C C H A R I D E) known as G Y C O G  E N.  (This is
        the process of  D E H Y D R A T I O N     S Y N T H E S I S)

31.  When this hormone functions properly by binding to its cellular
       P R O T E I N  receptor sites, the concentration of glucose in your body
       tissues will then start to DECREASE. 

     32.  The other hormone of the  I S L E T S  of  L A N G E R H A N S   is
                      known as  G L U C A G O N.   This hormone converts the starch
                      glycogen back into single  G L U C O S E   molecules.  (This is the
                      process of  H Y D R O L Y S I S.) 

              33.   When this hormone also binds to its protein  R E C E P T O R   sites.
                      the concentration of glucose in your body tissues will then start to 
                      INCREASE.

    34.   Since one hormone increases blood  G L U C O S E, while the others
                     lowers it, their actions are opposite (A N T A G O N I S T I C)  to each
                     other.  Together, this hormonal pair tends to keep blood sugar levels near
                     constant levels  (H O M E O S T A S I S). 

           

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