digestive system diseases ppt appendicitis powerpoint presentation appendix infection
disease inflammatory bowel chronic lung gut pulmonary obstructive between frontiersin axis links figure intestines lungs fimmu
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digestion true proteins protein solved begins chemical statements which denaturation hydrolysis enzymes some acids amino polypeptides stomach following into chewing
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energy stages catabolism metabolism organic atp food into general stage three four chemistry cellular conversion metabolic pathways biological occurs libretexts