Imagine eating a soda cracker, which is basically starch, fat, protein, and salt. How would each of these components be digested? Where within the digestive system would they be digested? Are any accessory organs involved?
What will be an ideal response?
Digestion begins in the oral cavity. Food triggers saliva from the parotids, rich in amylase, and from the submandibulars, rich in mucus. The tongue and teeth cooperate to mix all together and form a bolus. Digestion of fats and starch begins due to lingual lipase and salivary amylase. Swallowing reflexes send it to the stomach. Acid and pepsin greet the bolus. Peptides form from the wheat proteins due to action of pepsin. It then travels into the small intestine, where pancreatic lipase and amylase complete fat and starch digestion. Pancreatic enzymes reduce peptides to amino acids. The salt in the cracker is absorbed, and fatty acids diffuse into the epithelial cells because of their lipid character. Fat goes to lacteals and sugars and proteins go to the capillaries.
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