Final answer:
The human liver does not function in carbohydrate digestion; its primary roles include protein synthesis, detoxification, and bile production, which is essential for fat digestion.
Step-by-step explanation:
The correct answer to which of the following is NOT a function of the human liver is B) Carbohydrate digestion. The liver is responsible for several crucial functions including protein synthesis, for instance, through the production of plasma proteins like albumen; detoxification, by breaking down waste products and toxic substances; and bile production, which helps in fat digestion by emulsifying fat globules into smaller particles called micelles. It is the gallbladder that concentrates bile salts, which assists the liver. Although the liver does play a role in overall digestion, especially of fats, it is not directly involved in the digestion of carbohydrates; that process begins in the mouth with salivary amylase and continues in the small intestine with enzymes like pancreatic amylase.