How many gallbladders does an adult human have?

An adult human has one gallbladder. This small, pear-shaped organ is located beneath the liver and plays a crucial role in the digestive system by storing bile, which is produced by the liver. Bile helps in the digestion and absorption of fats.

The presence of only one gallbladder is a standard anatomical feature in humans. Although variations or conditions might lead to the presence of gallbladder-like structures or the absence of a gallbladder entirely in some individuals, under normal human anatomy, one gallbladder is typical. Understanding this concept is key in both medical and biological studies, as the gallbladder's singular function is vital for digestion and metabolism.