These secretions vary in compositions, but typically contain water, various enzymes, acids, and salts.
The process is completed in the small intestine. Absorption Which takes place primarily within the small intestine. There, most nutrients are absorbed from the lumen of the alimentary canal into the bloodstream through the epithelial cells that make up the mucosa.Lipids are absorbed into lacteals and are transported via the lymphatic vessels to the bloodstream (subclavian veins near the heart. Defecation The final step in digestion, undigested materials are removed from the bodyas feces. DEFINITION OF TERMSNutrition It is the result of the processes whereby the body takes in and usesfood for growth, development, and the maintenance of health. Nutrients -Chemical substances found in food that are necessary for good health. -To maintain health and functions properly the body must beprovided with nutrients. Essential Nutrients -Nutrients found only in food. -They are divided into six classes: Carbohydrates, fats (lipids),proteins, vitamins, minerals, water. -They are also divided into two categories organic and inorganic. Nonessential Nutrients-Nutrients that can be made by the body. -They may also be absorbed from food. -These nutrients are still required in order to maintain and achieve health. Macronutrients -They are called energy – providing nutrients (except water). -It is needed in large quantities (in gram range). -They normally include water, carbohydrates, fat, and protein. Micronutrients-These nutrients include minerals and vitamins.