NTR 307 Lecture Notes - Lecture 4: Portal Vein, Hepatic Veins, Special Route
Document Summary
Lecture 4: digestion, absorption, and transport part ii. Fingerlike projections on intestinal folds thousands per fold! Select and regulate nutrients absorbed based on needs of body. Enzymes and pumps act on different nutrients. Continuous blood flow o heart = pump. Delivers oxygen and nutrients to body tissues. Removes carbon dioxide and wastes from body tissues. Normal blood flow: heart arteries capillaries veins heart. Special route for digestive system blood: heart artery capillaries (in intestines) hepatic portal vein capillaries (in liver) hepatic vein heart. First to receive nutrients from gi tract (before heart) Prepares absorbed nutrients (carbohydrates, fats, proteins, etc. ) for use in the body. Detoxifies harmful substances; prepares waste for excretion. Circulation between cells in response to body movement. Collects in thoracic duct (behind heart) subclavian vein bloodstream. 100 trillion microbes: bacteria, viruses, fungi, protozoa, etc. Plant-based diet: high fiber = energy source for beneficial bacteria. Obese people: less diverse gut microbial life.
