What are phytochemicals, and how do they benefit plants and humans?

.  What are some of the possible complications involved in using herbal medicines?

  What are some steps someone should consider/do before purchasing supplements?

.  Name the four “assisting” organs that are not part of the GI tract but are needed for proper digestion.  What are their roles in digestion?

.  What substance makes the stomach contents acidic?  What substance protects stomach cells from the low pH of stomach contents?

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