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 B
Explanation
A. Mouth: Digestion in the mouth is primarily due to amylase, which breaks down carbohydrates, not trypsin.
B. Stomach: Trypsin is produced as trypsinogen in the pancreas and is activated in the small intestine. While trypsin is crucial for digestion, it is important in the small intestine.
C. Large intestine: The large intestine is mainly involved in water absorption, not digestion by enzymes like trypsin.
D. Oesophagus: The esophagus transports food but does not produce enzymes like trypsin.
Correct Answer is D
Explanation
A. Bacteria: Interferons are not primarily effective against bacteria; they are specific to viral infections.
B. Parasites: While some immune responses can involve interferons, they are not specifically targeted against parasites.
C. Fungi: Interferons have limited activity against fungal infections, making them less effective compared to their antiviral properties.
D. Viruses: Interferons are proteins produced by virus-infected cells that help to protect neighboring cells from viral infection by enhancing the immune response and inhibiting viral replication.
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