Which part of the oral cavity is a fleshy cluster of lymphoid tissue that protects the pharynx?
Uvula
Palatine tonsils
Hard palate
Esophageal sphincter
The Correct Answer is B
A. Uvula: The uvula is a small fleshy extension that helps with speech and prevents food from entering the nasal cavity but is not a lymphoid structure.
B. Palatine tonsils: The palatine tonsils are clusters of lymphoid tissue located at the back of the throat, protecting the pharynx from infections.
C. Hard palate: The hard palate forms the roof of the mouth and aids in chewing but has no immune function.
D. Esophageal sphincter: This is a muscular ring at the junction of the esophagus and stomach, not involved in immune defense.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Rugae: The rugae are folds in the stomach lining that expand when the stomach fills with food, increasing surface area for digestion.
B. Microvilli: Microvilli increase surface area in the small intestine, not the stomach.
C. Peritoneum: The peritoneum is a membrane surrounding the abdominal cavity, not involved in surface area expansion of the stomach.
D. Muscularis: The muscularis is the muscle layer responsible for stomach contractions but does not increase surface area.
Correct Answer is B
Explanation
A. Gastrin: Gastrin stimulates gastric acid secretion in the stomach, not pancreatic bicarbonate.
B. Secretin: Secretin stimulates the pancreas to secrete bicarbonate, which neutralizes stomach acid in the duodenum.
C. Somatostatin: Somatostatin inhibits many digestive processes, including the release of digestive hormones, not bicarbonate.
D. Cholecystokinin (CCK): CCK stimulates the release of digestive enzymes from the pancreas but not bicarbonate.
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