5.2.1 Draw and label a diagram of the carbon cycle to show the processes involved. 5.2.2 Analyse the changes in concentration of atmospheric carbon dioxide using historical records. 5.2.3 Explain the relationship between rises in concentrations of atmospheric carbon dioxide, methane and oxides of nitrogen and the enhanced greenhouse effect.
Choledochal cysts are congenital conditions associated with benign cystic dilatation of bile ducts. They are uncommon in western countries but not as rare in East Asian nations like Japan and China.
A choledochal cyst is a congenital dilatation of the extrahepatic bile duct. These patients do not have a ductal plate abnormality. The most common theory for the development of a choledochal cyst is that the dilatation is due to an underlying anomalous pancreatico-biliary junction.