mechanical and early chemical digestion
🍽️HUMAN ANATOMY STUDY GUIDE
Digestive System and Nutrient Absorption
Trace food through the tract and connect organ structure with digestion, secretion, and absorption.
8 key ideas8 flashcards5 practice questions
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Break food into absorbable units, then move them into blood or lymph.
digestion and absorption
transport away from the villus
Key ideas to know
Start with the relationships between ideas. Then close the notes and explain each one from memory.
- 01
The alimentary canal runs from mouth through pharynx, esophagus, stomach, intestines, rectum, and anus.
- 02
Peristalsis propels material, while segmentation mixes it.
- 03
The stomach begins protein digestion and forms chyme.
- 04
The pancreas sends bicarbonate and digestive enzymes into the duodenum.
- 05
The liver produces bile, and the gallbladder stores and concentrates it.
- 06
Most chemical digestion and nutrient absorption occur in the small intestine.
- 07
Villi and microvilli enlarge intestinal absorptive surface area.
- 08
The large intestine absorbs water and electrolytes and houses many resident microbes.
PART OF THE HUMAN ANATOMY GUIDE
See every set in this course and follow a focused review order.
Open the full Human Anatomy guide →Two ideas worth correcting now
NOT QUITE
→Bile digests fat with an enzyme
USE THIS INSTEAD
Bile emulsifies fat; pancreatic lipase performs chemical digestion.
NOT QUITE
→The stomach absorbs most nutrients
USE THIS INSTEAD
The small intestine performs most nutrient absorption.
Flashcards
Answer before opening each card. The effort to retrieve is part of the learning.
1What moves a bolus through the esophagus?Show answer ＋
Peristalsis.
2What enzyme begins protein digestion in the stomach?Show answer ＋
Pepsin.
3Where does bile come from?Show answer ＋
The liver produces it; the gallbladder stores and concentrates it.
4What does pancreatic bicarbonate do?Show answer ＋
Neutralizes acidic chyme entering the duodenum.
5Where does most absorption occur?Show answer ＋
The small intestine.
6What do villi do?Show answer ＋
Increase absorptive surface area.
7Where do most absorbed lipids enter first?Show answer ＋
Lacteals within intestinal villi.
8What does the large intestine absorb?Show answer ＋
Water and electrolytes.
Explain it in your own words
Use the answer as a check after you have written or spoken your response.
01Why does the stomach not digest itself under normal conditions?
A mucus-bicarbonate barrier, tight epithelial junctions, rapid cell replacement, and inactive enzyme precursors reduce injury.
02How does bile assist fat digestion?
Bile salts emulsify large fat droplets into smaller droplets, increasing surface area for lipase.
03Why are intestinal folds, villi, and microvilli useful?
They provide far more membrane area for digestion and absorption.
04How do amino acids reach the liver after absorption?
They enter intestinal blood capillaries and travel through the hepatic portal vein.
05Why can pancreatic duct blockage impair digestion?
Bicarbonate and enzymes cannot reach the duodenum normally.
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