Absorption in the Digestive Tract (Digestive System)
This follows the page about transit of foodstuffs through the alimentary tract.
Ingested foods pass through the:
- buccal cavity (mouth)*
- oesophagus (also known as the esophagus and as the "windpipe")*
- small intestine
- large intestine (incl. the rectum*)
Different types of substances (including e.g. nutrients such as vitamins and minerals) are absorbed into the bloodstream at different parts of the alimentary tract (which is also known as the "alimentary canal", the "gastrointestinal tract" and simply the "digestive tract").
It is useful to know which nutrients are absorbed by which parts of the digestive system.
The main absorption sites are listed below together with notes about important substances absorbed by each. (Recall from the function of the small intestine that approx 90% of the digestion and absorption of food occurs in the small intestine, the remaining 10% taking place in the stomach and large intestine.)
Absorption Sites in the Digestive Tract:
This information about absorption in the digestive tract is useful for answering questions such as:
- List the nutrients absorbed in the small intestine.
(or "List 6 nutrients absorbed in the small intestine", "List 8 nutrients absorbed in the small intestine", etc.)
- State which parts of the digestive tract absorb which components of broken-down foodstuffs.
- Where in the digestive tract is/are ________ absorbed ?
- State the main absorption sites in the digestive tract and give examples of what is absorbed at each location.