Mucosa: The deepest layer of the alimentary canal.The duodenum is the first section of intestine that connects to the pyloric sphincter of the stomach. It is the shortest region of the small intestine, measuring only about 10 inches in length. Partially digested food, or chyme, from the stomach is mixed with bile from the liver and pancreatic juice from the pancreas to complete its digestion in the duodenum.The jejunum is the middle section of the small intestine that serves as the primary site of nutrient absorption. It measures around 3 feet in length.
The ileum is the final section of the small intestine that empties into the large intestine via the ileocecal sphincter. The ileum is about 6 feet long and completes the absorption of nutrients that were missed in the jejunum.Submucosa: The second deepest layer. The blood vessels carry away the nutrients that are absorbed, and the nerve endings stimulate the muscle fibers so that the food is continually moving by peristalsis. Muscular layer: The second superficial layer. peristalsis Serous layer: The most superficial layer.The duodenum is the first section of intestine that connects to the pyloric sphincter of the stomach. It is the shortest region of the small intestine, measuring only about 10 inches in length. Partially digested food, or chyme, from the stomach is mixed with bile from the liver and pancreatic juice from the pancreas to complete its digestion in the duodenum. The jejunum is the middle section of the small intestine that serves as the primary site of nutrient absorption. It measures around 3 feet in length. The ileum is the final section of the small intestine that empties into the large intestine via the ileocecal sphincter. The ileum is about 6 feet long and completes the absorption of nutrients that were missed in the jejunum. |
Hyperlink to Peristalsis: https://www.youtube.com/watch?v=o18UycWRsaA
Stomach Labeling
External:
External:
Internal:
Hyperlink to sound of the stomach growling: https://www.youtube.com/watch?v=ZhlrMGQ80_A
Three things that happen in the oral cavity: chemical and Mechanical Digestion and Saliva glands lubricate food so it can pass from the pharynx to the esophagus.
Components of Gastric Juice: Pepsin - Enzyme; digests proteins.
Hydrochloric Acid- Denatures proteins; decreases pH (for optimum pepsin function).
Intrinsic factor- protects and allows later absorption of vitamin b12.
Mucus- Lubricates chyme; protects stomach lining.
water- Dilutes food and other substances; facilitates mixing.
Hydrochloric Acid- Denatures proteins; decreases pH (for optimum pepsin function).
Intrinsic factor- protects and allows later absorption of vitamin b12.
Mucus- Lubricates chyme; protects stomach lining.
water- Dilutes food and other substances; facilitates mixing.
Three regions of the small intestine-
- The duodenum is the first section of intestine that connects to the pyloric sphincter of the stomach. It is the shortest region of the small intestine, measuring only about 10 inches in length. Partially digested food, or chyme, from the stomach is mixed with bile from the liver and pancreatic juice from the pancreas to complete its digestion in the duodenum.
- The jejunum is the middle section of the small intestine that serves as the primary site of nutrient absorption. It measures around 3 feet in length.
- The ileum is the final section of the small intestine that empties into the large intestine via the ileocecal sphincter. The ileum is about 6 feet long and completes the absorption of nutrients that were missed in the jejunum.
Major functions of the colon and possible causes for diarrhea and constipation:The colon removes water, salt, and some nutrients forming stool. Muscles line the colon's walls, squeezing its contents along. Billions of bacteria coat the colon and its contents, living in a healthy balance with the body. Everyday things such as food, medication, or stress can cause diarrhea.Some causes of constipation are: Inadequate water intake.
Inadequate fiber in the diet.
A disruption of regular diet or routine; traveling.
Inadequate activity or exercise or immobility.
Eating large amounts of dairy products.
Stress.
Inadequate fiber in the diet.
A disruption of regular diet or routine; traveling.
Inadequate activity or exercise or immobility.
Eating large amounts of dairy products.
Stress.