What is the aetiology of tissue damage associated with pancreatitis?
insulin toxicity
autoimmune destruction of the pancreas
leakage of pancreatic enzymes
viral infection of the gallbladder
The Correct Answer is C
A. Insulin toxicity: Insulin toxicity is not associated with pancreatitis. Insulin affects glucose metabolism and does not directly cause pancreatic tissue injury. This mechanism is unrelated to the pathophysiology of pancreatic inflammation.
B. Autoimmune destruction of the pancreas: Autoimmune processes can lead to chronic pancreatitis or type 1 diabetes, but acute tissue damage in pancreatitis is not typically due to immune-mediated destruction. While autoimmune pancreatitis exists, it is not the most common cause of pancreatic tissue injury.
C. Leakage of pancreatic enzymes: In pancreatitis, premature activation and leakage of pancreatic enzymes such as trypsin and lipase cause autodigestion of pancreatic tissue. This enzymatic activity leads to inflammation, edema, necrosis, and systemic complications. It is the primary mechanism of tissue damage in acute pancreatitis.
D. Viral infection of the gallbladder: Viral infections affecting the gallbladder do not directly cause pancreatitis. Gallstones or biliary obstruction may precipitate pancreatitis, but viral infection of the gallbladder itself is not a common etiologic factor.
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Related Questions
Correct Answer is A
Explanation
A. Gallstone pain, or biliary colic, is caused by obstruction of the cystic or common bile duct by gallstones. The pain is typically located in the right upper quadrant of the abdomen. Due to shared nerve pathways (referred pain via the phrenic nerve), the pain often radiates to the right shoulder or right scapular area.
Correct Answer is D
Explanation
A. Cigarette smoke: Cigarette smoking is the leading risk factor for lung cancer and is strongly associated with multiple histologic types. Tobacco smoke contains numerous carcinogens that cause DNA damage in lung tissue. Risk increases with duration and intensity of exposure.
B. Arsenic: Arsenic exposure, particularly in occupational or environmental settings, has been linked to an increased risk of lung cancer. Chronic inhalation can lead to cellular damage and malignant transformation. It is a well-established environmental carcinogen.
C. Asbestos: Asbestos exposure is strongly associated with lung cancer and mesothelioma, especially when combined with cigarette smoking. Inhaled fibers cause chronic lung irritation and fibrosis, increasing cancer risk. The latency period can be several decades.
D. Viral infection: Viral infections are not recognized as a primary risk factor for lung cancer. While some viruses are associated with other cancers, they do not play a significant role in lung carcinogenesis. Lung cancer risk is mainly related to environmental and occupational exposures.
E. Radioactive dust: Exposure to radioactive dust, such as radon decay products, is a known risk factor for lung cancer. Inhaled radioactive particles emit radiation that damages lung tissue over time. This exposure is a significant risk, especially in poorly ventilated areas.
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