BIO 1050 Lecture Notes - Lecture 3: Chyme, Sodium Bicarbonate, Microvillus
Document Summary
*list the organs involved in digestion and their primary functions will be on test in many different ways! Digestion: the physical and chemical breakdown of large molecules (of food) into smaller absorbable molecules. Absorption: the movement of these small nutrient molecules across the cell membrane of cells lining the digestive tract. Elimination: elimination of undigested food residue from the body. Lumen- hollow space where the food is passing through at a microscopic level. Hunger and thirst: physical needs- drive how much and how often we eat. Processes of breaking down food into absorbable components. Gastrointestinal (gi) tract consists of: mouth, pharynx, esophagus, stomach, small intestine, large intestine. Accessory organs: salivary glands, liver & gall bladder, pancreas. Mechanical digestion: breaks down large food molecules to smaller food molecules. Peristalsis: the forward, rhythmic muscular contraction that moves food through the gi tract. Chemical digestion: digestive juices and enzymes break down food into absorbable nutrients.
