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The human gallbladder is a hollow grey-blue organ that sits in a shallow depression below the right lobe of the liver. [2] In adults, the gallbladder measures approximately 7 to 10 centimetres (2.8 to 3.9 inches) in length and 4 centimetres (1.6 in) in diameter when fully distended. [3]
A gallstone is a stone formed within the gallbladder from precipitated bile components. [2] The term cholelithiasis may refer to the presence of gallstones or to any disease caused by gallstones, [5] and choledocholithiasis refers to the presence of migrated gallstones within bile ducts. Most people with gallstones (about 80%) are asymptomatic.
In the developed world, 10 to 15% of adults have gallstones. [3] Of those with gallstones, biliary colic occurs in 1 to 4% each year. [3] Nearly 30% of people have further problems related to gallstones in the year following an attack. [3] About 15% of people with biliary colic eventually develop inflammation of the gallbladder if not treated. [3]
The most common cause of bile duct obstruction is when gallstone(s) are dislodged from the gallbladder into the cystic duct or common bile duct resulting in a blockage. A blockage of the gallbladder or cystic duct may cause cholecystitis. If the blockage is beyond the confluence of the pancreatic duct, this may cause gallstone pancreatitis.
Common bile duct stone, also known as choledocholithiasis, is the presence of gallstones in the common bile duct (CBD) (thus choledocho-+ lithiasis). This condition can cause jaundice and liver cell damage. Treatments include choledocholithotomy and endoscopic retrograde cholangiopancreatography (ERCP).
Cholelithiasis (gallstones) Can predispose to cholecystitis (gall bladder infections) and ascending cholangitis (biliary tree infection) Can progress to choledocholithiasis (gallstones in the bile duct) and gallstone pancreatitis (inflammation of the pancreas) Gastric calculi can cause colic, obstruction, torsion, and necrosis.
Synthesis of bile acids is a major route of cholesterol metabolism in most species other than humans. The body produces about 800 mg of cholesterol per day and about half of that is used for bile acid synthesis producing 400–600 mg daily. Human adults secrete between 12 and 18 g of bile acids into the intestine each day, mostly after meals.
Collisions with wind turbines are a minor source of bird mortality compared to other human causes. The impact of wind energy on birds, which can fly into turbines, or have their habitats degraded by wind development, is complex. Displacement is thought to be more of a threat to species than collisions. [109]