Which of the following is not a chemical barrier?
enzymes
complement
interferons
ciliated epithelium
The Correct Answer is D
A. enzymes: many enzymes (e.g., lysozyme in saliva/tears) are chemical barriers to microbes.
B. complement: the complement system is a set of plasma proteins that chemically attack pathogens (a chemical innate defense).
C. interferons: interferons are signaling proteins that help inhibit viral replication and are considered chemical immune defenses.
D. ciliated epithelium: ciliated epithelium is a physical/mechanical barrier (moves mucus and trapped particles), not a chemical barrier.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"C"}
Explanation
A. Glottal: The glottis refers to the vocal apparatus/opening, not a cartilage
B. Tracheal: Tracheal cartilage are rings of the trachea, not one of the three major laryngeal cartilages
C. Epiglottal: The epiglottic (epiglottal) cartilage forms the epiglottis, and along with thyroid and cricoid cartilages is considered a major laryngeal cartilage -correct (choice corresponds to epiglottic cartilage).
D. Hyoidal: The hyoid is a bone (not one of the larynx’s three major cartilages) that supports the larynx
Correct Answer is D
Explanation
A. arteriole: arterioles are small, muscular arteries with thicker walls and no valves; lymphatics are thin-walled and valved.
B. artery: arteries have thick, muscular, elastic walls to withstand high pressure; lymphatic vessels are thin-walled and low-pressure.
C. capillary: capillaries are tiny single-cell-thick vessels for exchange; lymphatics are larger and have valves.
D. vein: lymphatic vessels have thin walls and valves and operate under low pressure, making them most similar in structure/function to veins.
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