Gallbladder (Latin Vesica fellea) is a pear-shaped organ that serves as a reservoir for bile, which is concentrated in it and becomes three to four times thicker than the one that comes from the liver.
Gallbladder is from 8-11 cm long and is located on the lower side of the right and liver lobe. The liver continuously secretes bile, regardless of digestion and that bile leaves the liver through the hepatic channel and goes through the bile channel into the duodenum. If there is no digestion, sphincter is closed and bile must go back to the gall bladder where water is removed from it. In this way it becomes more concentrated and capable of degrading entered food.
The gallbladder contains about 50 ml of bile, which is released when food containing fat enters the digestive tract, stimulating the secretion of cholecystokinin.
Gallbladder have vertebrate (except horses and rats), while invertebrates do not possess gallbladder.
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