Introduction to Digestion
- The digestive system is an example of an organ system in which several organs work together to digest and absorb food
- Digestion is a process in which relatively large, insoluble molecules in food (such as starch and proteins) are broken down into smaller, soluble molecules that can be absorbed into the bloodstream and delivered to cells in the body
- These small, soluble molecules (such as glucose and amino acids) are used either to release energy (via respiration) to the cells, or to provide cells with materials with which they can build other molecules to grow, repair and function
- The human digestive system is made up of the organs that form the alimentary canal, and accessory organs
- The alimentary canal is the channel or passage through which food flows through the body, starting at the mouth and ending at the anus
- Digestion occurs within the alimentary canal
- Accessory organs produce substances that are needed for digestion to occur (such as enzymes and bile) but food does not pass directly through these organs
The human digestive system includes the organs of the alimentary canal and accessory organs that work together to break large insoluble molecules into small soluble molecules