Digestive
The digestive system comprises the alimentary canal from mouth to anus and accessory organs (liver, gallbladder, pancreas) processing food ingestion, enzymatic digestion, nutrient absorption, and waste elimination.
Quantitative Metrics & Physiological Scale
Continuous mucosal tube from oral cavity to anal canal
Expanded exponentially by plicae circulares, villi, and microvilli
Largest internal metabolic and exocrine glandular organ
Hydrochloric acid and pepsinogen secretion for protein breakdown
Physiological Role & Homeostasis
Mechanical peristalsis and enzymatic hydrolysis of carbohydrates, proteins, and lipids
Epithelial transcellular and paracellular absorption of monosaccharides, amino acids, and minerals
Hepatic biochemical detoxification, glycogen storage, and continuous bile production
Small Intestine vs Large Intestine
| Feature / 比较维度 | Small Intestine / 小肠 (十二指肠/空肠/回肠) | Large Intestine / 大肠 (盲肠/结肠/直肠) |
|---|---|---|
| Length & Lumen / 解剖长度与管径 | ~6-7 meters; narrower caliber / 约 6-7 米；管腔较细，蠕动快速 | ~1.5 meters; wider caliber / 约 1.5 米；管腔宽大，运送缓慢 |
| Special Surface Features / 肠壁特有解剖标志 | High density of mucosal villi & circular folds / 密集环状襞与富含毛细血管网的指状肠绒毛 | Teniae coli, haustra & epiploic appendages / 结肠带、结肠袋与外表面腹膜形成的肠脂垂 |
| Primary Physiological Duty / 主要生理功能 | Complete macromolecule digestion & 90% nutrient uptake / 绝大部分碳水、蛋白质、脂肪与维生素的水解吸收 | Water/electrolyte reclamation & fecal compaction / 水分重吸收、微量电解质摄取与粪便成形固化 |
Vital Organs & Structures
Liver
A gland that processes nutrients, participates in metabolism and produces bile for digestion.
Intestine
The small and large intestines contribute to digestion, absorption and the formation and passage of feces.
Pancreas
A dual-purpose gland that releases digestive enzymes into the gut and the hormones that steady blood sugar.
How to Study This System in 3D
Toggle the exploded view slider to dynamically separate the retroperitoneal organs (pancreas, duodenum) from mesenteric loops.
Trace the portal vein bifurcation entering the porta hepatis from superior mesenteric and splenic veins.
Explore Synergistic Anatomical Systems
For educational use only; not medical advice, diagnosis, or treatment.