Which of the following statements about accessory organ secretions is not true?
a. Hepatocytes produce bile, which drains out of the liver via the common hepatic ducts.
b. Saliva contains secretory IgA and lysozyme, which play an important role in preventing the growth of pathogenic bacteria in the oral cavity.
c. Pancreatic juice contains digestive enzymes and bicarbonate ions to neutralize the acidic chyme.
d. The gallbladder produces bile, which drains out of the gallbladder via the cystic duct.

검증된 단계별 안내

Step 1: Understand the role of accessory organs in the digestive system. Accessory organs include the liver, gallbladder, pancreas, and salivary glands. Each of these organs produces or stores substances that aid in digestion.

Step 2: Analyze each statement provided in the question. For each statement, determine whether it accurately describes the function or secretion of the accessory organ mentioned.

Step 3: For statement (a), recall that hepatocytes (liver cells) produce bile, which is transported out of the liver via the common hepatic ducts. This is a true statement.

Step 4: For statement (b), note that saliva contains secretory IgA and lysozyme, which are antimicrobial agents that help prevent bacterial growth in the oral cavity. This is also a true statement.

Step 5: For statement (d), evaluate whether the gallbladder produces bile. The gallbladder does not produce bile; it stores and concentrates bile produced by the liver. This makes statement (d) incorrect, as bile drains out of the gallbladder via the cystic duct but is not produced there.

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주요 개념

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Accessory Organs of Digestion

Accessory organs of digestion include the liver, pancreas, and gallbladder, which play crucial roles in the digestive process. The liver produces bile, the pancreas secretes digestive enzymes and bicarbonate, and the gallbladder stores and concentrates bile. Understanding the functions of these organs is essential for analyzing statements about their secretions.

Bile Production and Function

Bile is produced by hepatocytes in the liver and is essential for the emulsification and digestion of fats. It is stored in the gallbladder and released into the small intestine via the common bile duct. Recognizing the correct pathways and functions of bile is vital for evaluating statements regarding its production and drainage.

Components of Saliva

Saliva is a complex fluid produced by salivary glands, containing enzymes, electrolytes, and antimicrobial agents like secretory IgA and lysozyme. These components help in the initial digestion of food and protect the oral cavity from pathogens. Understanding the role of saliva is important for assessing its contributions to oral health and digestion.