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level: 6.10 Absorption of the products of digestion

Questions and Answers List

level questions: 6.10 Absorption of the products of digestion

QuestionAnswer
Structure of ileum- Villi - Thin walls - Lined with epithelial cells - Has rich network of blood capillaries
Villi- Between the lumen (cavity) of intestines
Adaptations for absorption- Microvilli, LSA for diffusion - Thin walls, shorter diffusion path - Muscles, able to move - Many blood vessels, carry absorbed molecules, maintains diffusion gradient
Digestion and ileum- Products of digestion are absorbed by ileum epithelium into the bloodstream
Absorption of lipids (1)- Lipase hydrolyses trig. - fatty acids + glycerol - Most digested into monoglycerides + 2 F.As
Absorption of lipids (2)- Bile salts emulsify the lipids into small droplets, micelle - Can diffuse into epithelial cells
Absorption of lipids (3)- Trig. then reform and are coated with phospholipids, proteins, cholesterol + chylomicrons
Absorption of lipids (4)- Then released by exocytosis - Then enter the lacteals of the lymphatic system
Absorption of amino acids- Absorbed same way as glucose