BIOG 1440 L8 Absorption Diagram

DRAW the full digestion and absorption diagram from memory (7 tract parts in order, 4 secretion sources, 3 absorption arrows with where each goes), then flip to check

Tract = Mouth → Esophagus → Stomach → Small intestine → Large intestine → Rectum → Anus. Secretions = salivary glands (mouth), gastric glands (stomach), liver and pancreas (small intestine). Absorption = lipids → lymphatic system → veins to heart; absorbed food except lipids → hepatic portal vein → liver → veins to heart; water → hepatic portal vein (from small AND large intestine). [Slide L8 p.29]

DRAW only the absorption half of the diagram from memory (three absorbed categories and every vessel or organ each passes through)

Lipids → lymphatic system → veins to heart. Food except lipids (sugars, amino acids) → hepatic portal vein → liver → veins to heart. Water → hepatic portal vein → liver.

Fill in the tract order. Mouth → ___ → Stomach → ___ → ___ → Rectum → ___

Esophagus; Small intestine; Large intestine; Anus

Name the source of secretions entering at the mouth, at the stomach, and at the small intestine (two sources for the last)

Mouth = salivary glands; Stomach = gastric glands; Small intestine = liver (bile, stored in gallbladder) and pancreas

Absorbed lipids first enter the ___, which then drains into the ___

Lymphatic system; veins to the heart (lipids bypass the liver at first)

Absorbed sugars and amino acids enter the ___ and travel first to the ___

Hepatic portal vein; liver (then on to the veins to the heart)

Which two regions of the tract absorb water, and which vessel does it enter?

Small intestine and large intestine; the hepatic portal vein (toward the liver)

Where is most food absorbed, and what structural feature makes that region good at it?

Small intestine (jejunum and ileum); villi and microvilli (brush border) give an enormous surface area, and transport across the epithelium can be active or passive [Slide L8 p.28]