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.
Choledochal cysts are characterized by a dilation of the ducts that transport bile, and can occur anywhere between the liver, where bile is produced, and the first part of the intestine (duodenum), where it empties. They can occur in the ducts either inside or outside the liver.