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. Glomerulus: The glomerulus is a high-pressure capillary bed in the nephron where filtration of blood occurs.
B. Bowman's capsule: This is the cup-shaped structure surrounding the glomerulus, not a capillary bed.
C. Vasa recta: These are capillaries surrounding the loop of Henle, involved in the reabsorption process, not filtration.
D. Macula densa: This is a group of specialized cells in the distal convoluted tubule that sense sodium concentration and affect glomerular filtration rate, but it is not a capillary bed.
Correct Answer is A
Explanation
A. Cystic duct: The cystic duct connects the gallbladder to the bile ducts and allows bile to flow into and out of the gallbladder.
B. Common hepatic duct: This duct carries bile from the liver but does not directly lead to the gallbladder.
C. Pancreatic duct: This duct transports digestive enzymes from the pancreas to the duodenum, not bile.
D. Left hepatic duct: This carries bile from the left side of the liver and eventually merges into the common bile duct, but it does not lead directly to the gallbladder.
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