Which organ is absent in horses but present in many other mammals for bile storage?

Question

BlackTom AI · Accepted Answer

Question restatement: Which organ is absent in horses but present in many other mammals for bile storage?

Option 1: Spleen. The spleen is a lymphoid organ involved in immune response and blood filtration; it is present in horses as in most mammals, so this option is incorrect for the stated criterion.

Option 2: Liver. The liver is a large organ involved in metabolism and bile production; horses have a liver, so this option does not fit the description of an organ absent in horses.

Option 3: Pancreas. The pancreas secretes digestive enzymes and hormones; it is present in horses, making this option inaccurate for the question’s condition.

Option 4: Gall bladder. The gallbladder stores bile produced by the liver in many mammals; however, horses lack a gallbladder, so this organ is absent in horses while present in many other species for bile storage. This aligns with the given criterion.

Summary of misconceptions: A common error is assuming the gallbladder is universal across mammals; in reality, some species, like horses, do not have one, while others do. The spleen, liver, and pancreas are consistently present across these animals and do not meet the criterion of being absent in horses.

ANSC20002_2025_SM2 Week 6 quiz

Which organ is absent in horses but present in many other mammals for bile storage?

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