Ingestion – the act of eating food or drinking Digestion – breaking food down into smaller pieces (mechanical digestion) or smaller molecules (chemical digestion) Absorption – the uptake of small nutrient molecules into the body Elimination – the passage of undigested waste from the
Stomach The stomach holds food while it is being mixed with enzymes that continue the process of breaking down food. Cells in the lining of the stomach secrete a strong acid and powerful enzyme that are responsible for the breakdown process. When the contents of the stomach are successfully processed, they are released into the small intestine. Small intestine The small intestine has 3 parts; the duodenum, jejunum, and ileum — the small intestine breaks down food using enzymes released by the pancreas and bile from the liver. It moves food through and mixing it with digestive secretions from the pancreas and liver.
What does the portal vein drain? It drains blood from the pancreas, spleen and digestive organs and delivers it to the liver. 18. What is the function of the dorsalis pedis artery? It functions to carry oxygenated blood from the dorsal surface of the foot.
Identify three mechanical digestion activities. a. Chewing b. Mixing of food with saliva by tongue c. Churning food in the stomach and segmentation of the intestines 3. Name two feedback loops that regulate digestive system smooth muscle responsible for propulsive and mixing movements. Hormonal feedback loops and neural feedback loops. Neural Regulation of Mechanical Digestion 4.
SCI/241 THE SCIENCE OF NUTRITION January13,2012 Human Digestion How the does the digestive system works to absorbs nutrients? Digestion starts with the smell of food, it activates the salivary glands. The gland secret saliva that moistens food, it also contains a digestive enzyme called amylase that breaks down some carbohydrates before it leaves the mouth. Then the food is swallowed and goes into the lumen through the esophagus. The esophagus muscles contractions called peristalsis forces the food through the sphincter valve and into the stomach.