question_answer 112)

    How do carbohydrates, proteins and fats get digested in human beings?

Answer:

                  Digestion of carbohydrates starts from Buccal cavity The food receives saliva in the buckle cavity, which contains salivary amylase. It breaks down starch into simple (glucose) sugar Starch and glycogen, Maltose + Ismaltose + Limit dextrins in small intestine (i) Pancreatic juice contains pancreatic amylase, which acts in further breakdown the starch. Starch and glycogen  Maltose + Isomaltose + Limit dextrins (ii) Intestinal juice contains the following Intestinal amylase hydrolyses the remaining starch and glycogen. Maltose  Glucose IsomaltoseGlucose Sucrose Glucose + Fructose Lactose  glucose + Galactose Digestion of Proteins starts In stomach Inactive from of pepsin is secreted known as pepsinogen which in presence of HCI forms pepsin and digests protein. Pepsinogen  Pepsin Proteins Proteoses and peptones In small intestine (i) Pancreatic juice secretes Trypsinogen, chymotripsinogen (inactive from of trypsin) which an activation forms trypsin and digest protein. (ii) Intestinal juice Peptides  Dipeptides + Amino acids DipeptidesAmino acids Digestion of Fats begins in small intestine (i) Bile emulsifies fats into smaller droplets (ii) Pancreatic juice present in small intestine acts as follows Triglyceride  Fatty acid + lipase Fatty acid + Glycerol Monoglycerides di glyceride (ii) Intestinal juice acts as Triglycerides + Diglycerides Fatty acids and glycerol + Monoglycerides