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Select the INCORRECT pair related to digestive glands and their enzymes.
Salivary gland - trypsin
Liver - bile juice
Gastric gland - pepsin
Pancreas - pancreatic juice
Salivary gland - trypsin
The pair 'Salivary gland - trypsin' is incorrect because the salivary glands secrete salivary amylase (ptyalin), which breaks down starch into maltose. Trypsin is a proteolytic enzyme secreted by the pancreas in an inactive form, trypsinogen, which is activated in the small intestine to digest proteins.
The pair 'Salivary gland - trypsin' is incorrect because the salivary glands secrete salivary amylase (ptyalin), which breaks down starch into maltose. Trypsin is a proteolytic enzyme secreted by the pancreas in an inactive form, trypsinogen, which is activated in the small intestine to digest proteins.
Think of enzymes like specialized keys; the salivary gland provides a 'carb-key' for starch, while the pancreas provides a 'protein-key' (trypsin) for meat; they cannot function if you swap their locations.
STP: Salivary (Amylase), Trypsin (Pancreas), Pepsin (Gastric/Stomach).
StarchSalivary┬аAmylaseтАЛMaltose
TrypsinogenEnterokinaseтАЛTrypsin
Digestive enzymes are highly specific to their substrates and physiological environments. Salivary amylase operates at a slightly acidic-to-neutral pH in the mouth for carbohydrate digestion, while trypsin is produced as a zymogen (trypsinogen) in the pancreas and enters the duodenum to break down peptide bonds in proteins at a slightly alkaline pH.
Salivary glands secrete salivary amylase to initiate starch digestion.
Trypsin is synthesized in the pancreas and works in the small intestine.
Bile juice is produced by the liver to emulsify fats, though it contains no digestive enzymes.
Gastric glands secrete pepsin (as pepsinogen) for protein digestion in the acidic environment of the stomach.
Digestion of dietary starch in the oral cavity.
Digestion of proteins in the duodenum.
Emulsification of fats by bile salts in the small intestine.
Option B (Liver - bile juice) is correct as the liver produces bile, which is stored in the gall bladder.
Option C (Gastric gland - pepsin) is correct as chief cells in the gastric glands secrete pepsinogen, which converts to pepsin.
Option D (Pancreas - pancreatic juice) is correct as the pancreas is a heterocrine gland that secretes pancreatic juice containing enzymes like trypsin, lipase, and amylase.
A is correct тАФ Salivary glands produce amylase, not trypsin.
Always remember the site of secretion vs. the site of action for digestive enzymes; the pancreas is the 'master gland' for chemical digestion in the small intestine.
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