Biology – 7.2 Human nutrition – alimentary canal | e-Consult
7.2 Human nutrition – alimentary canal (1 questions)
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The structure of a bile duct is well-adapted to its function of transporting bile from the liver and gallbladder to the small intestine. It exhibits the following adaptations:
- Muscular walls: The bile duct walls contain smooth muscle tissue. This allows for peristalsis – rhythmic contractions that propel bile forward.
- Connects to both the liver and gallbladder: The bile duct receives bile from the hepatic ducts (which carry bile from the liver) and the cystic duct (which carries bile from the gallbladder). This ensures a continuous supply of bile.
- Relatively large diameter: The bile duct has a relatively large diameter to accommodate the volume of bile produced by the liver and stored in the gallbladder.
- Lined with epithelial cells: The inner lining of the bile duct is made up of epithelial cells that secrete mucus, which helps to protect the duct from damage by bile.
| Adaptation | Function |
| Muscular Walls | Propels bile via peristalsis. |
| Connects to Liver & Gallbladder | Ensures continuous bile supply. |
| Large Diameter | Accommodates bile volume. |
| Epithelial Lining | Protects duct from bile damage. |