Digestive SystemATI TEAS 7 cheat sheet

Mouth to absorption

10 key facts 5 practice questions Reviewed Oct 2026

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The Path

Mouth → esophagus → stomach → small intestine → large intestine
Peristalsis moves food along
Most absorption happens in the small intestine

Chemical Breakdown

Amylase (saliva) starts carbohydrates
Pepsin (stomach, acidic) starts protein
Bile from the liver emulsifies fat; stored in the gallbladder
The pancreas sends enzymes and bicarbonate to the duodenum

Absorption

Villi and microvilli multiply the surface area
The large intestine absorbs water and forms stool

Accessory Organs

Liver, gallbladder and pancreas aid digestion but food does not pass through them

Key takeaway

Mouth to absorption

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