You may want to review membrane transport in the cell module. This process can happen passively or require ATP cellular energy. In order to absorb digested substances, that material has to be first moved from the lumen, into the apical or tube-side of the epithelial cells lining the digestive tract, then out of the other basal side of those cells, into the body’s interstitial fluid, and into blood or lymph capillaries for transport through the body. These substances will assist with the movement of food from one part of the tract to the next (such as mucus) and with the digestion of the food while it is in the tube (such as enzymes). These secretions come from both the cells that make up the epithelial lining of the digestive tract and from exocrine accessory organs that have ducts emptying into the tube. All digestive system organs play vital roles in breaking down food moving through the gastrointestinal tract into its chemical building blocks, absorbing these building blocks into the blood, and eliminating residual indigestible materials.ĭifferent parts of the digestive system will secrete substances into the digestive tract lumen. Within the digestive system, the gastrointestinal tract is a continuous hollow tube from the mouth to the anus and is technically contiguous with the external environment. The digestive system moves water, nutrients and electrolytes from the external environment to the internal environment. Chapter 9: The Lymphatic System and Immunityĥ3. Endocrine Homeostasis and Integration of Systemsĥ9. Introduction to the Respiratory Systemħ0. Reproductive Structures and Functions Chapter 3: Homeostasis and Feedback LoopsĢ3. Introduction to the Integumentary SystemĢ4. Integumentary Structures and Functionsģ9. Nervous System Levels of OrganizationĤ2. Cardiovascular Structures and FunctionsĤ3. Cardiovascular Levels of OrganizationĤ5. Cardiovascular Integration of Systems Chapter 2 Part 4: Higher Order Structuresġ8. Organ Systems, The Whole Body, and Populations Chapter 2 Part 1: Levels of Organization - Introductionġ5. Cell Division and Control of Cell Number Chapter 1: Introduction to Anatomy and Physiology

Gastric lumen meaning