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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Parietal Cell: Parietal cells are responsible for secreting hydrochloric acid (HCl) and intrinsic factor, not pepsinogen. HCl activates pepsinogen into pepsin.
B. Mucous Neck Cell: Mucous neck cells secrete mucus to protect the gastric lining but do not secrete pepsinogen.
C. Chief Cell: Chief cells (also known as zymogenic cells) are specialized cells in the stomach that secrete pepsinogen, the inactive precursor of the digestive enzyme pepsin.
D. Enteroendocrine Cell: Enteroendocrine cells secrete hormones like gastrin, which regulates digestive processes, but they do not secrete pepsinogen.
Correct Answer is B
Explanation
A. Subclavian duct: There is no specific "subclavian duct" for lymph drainage; lymphatic fluid drains into the subclavian veins.
B. Thoracic duct: The thoracic duct drains lymph from the lower limbs and the left side of the body, returning it to the circulatory system at the junction of the left subclavian and internal jugular veins.
C. Left lymphatic duct: The thoracic duct is often referred to as the left lymphatic duct but is not limited to just left drainage.
D. Right lymphatic duct: The right lymphatic duct drains lymph from the right upper quadrant of the body but does not drain lymph from the lower limbs.
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