🍞🍗🧈 Functions of Key Digestive Enzymes: A Visual Breakdown for MCAT & DAT

Whether you’re prepping for the MCAT, DAT, or NCLEX, understanding digestive enzymes is critical. These enzymes catalyze the breakdown of macromolecules — carbohydrates, proteins, and fats — into absorbable units.

🍞 Carbohydrate-Digesting Enzymes

Enzyme	Function	Location
Amylase	Breaks starch into smaller sugars	Saliva (mouth), pancreas
Sucrase-isomaltase	Breaks sucrose and isomaltose	Small intestine
Maltase	Breaks maltose into glucose	Brush border enzymes
Lactase	Breaks lactose into glucose + galactose	Small intestine

🔍 MCAT Insight: Lactase deficiency = lactose intolerance, tested often in passage-based questions.

🍗 Protein-Digesting Enzymes

Enzyme	Function	Secreted By
Pepsin	Breaks proteins in the stomach	Chief cells (stomach)
Trypsin	Activates other proteases	Pancreas (as trypsinogen)
Peptidase	Cleaves peptides into amino acids	Small intestine lining

🧠 MCAT/DAT Pro Tip: Pepsin works best in acidic pH, trypsin in alkaline — easy testable point.

🧈 Fat-Digesting Enzyme

Enzyme	Function	Action Site
Lipase	Breaks triglycerides into fatty acids + glycerol	Small intestine

✅ Paired with bile from the liver, which emulsifies fats and improves lipase activity.

🧠 Summary Mnemonic

“A Little Milk Protein Later”
Amylase – Lactase – Maltase – Pepsin – Lipase

Helps you remember enzyme types in order of macromolecule breakdown: carbs first, protein second, fats last.

🔬 Where You'll See This on Exams

• 🧪 MCAT Biology: Digestive system physiology passages

• 🧬 DAT Bio: Enzyme types and nutrient absorption

• 🏥 NCLEX: Dietary restriction, enzyme deficiencies, GI disorders

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Frequently Asked Questions (FAQs)

• How many hours should I study for the MCAT each day?

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