FOOD 2150 Lecture Notes - Lecture 3: Lymphatic System, Glycogen, Chylomicron
12 Sep 2017
School
Department
Course
Professor
Document Summary
Accessory organs to the gi tract: liver (clearing house) Secrete bile (salts and cholesterol for emulsification of lipids, bilirubin) Carbohydrate and amino acid metabolism: gall bladder. Secretes insulin and other hormones: kidney (not entirely part of the digestion system) Blood filtering and excretion of end products (urea, usually from the digestion of protein: ammonia) The movement of nutrients from the lumen of the gastrointestinal tract into the body. Two general possibilities: movement of water soluble molecules. Blood vessels from the gi tract take water soluble molecules to the liver, which plays a central role. Sugars, amino acids, vitamins and some minerals. Water-soluble toxins, the liver acts to de-toxify. Small molecules pass through microvilli to the hepatic portal vein. Osmotic control by hormones: movement of fat soluble molecules. The lymphatic system takes fat soluble compounds from the gi tract through the thoracic duct to the bloodstream. Fats do not go through the liver.
