This epithelium, located in the respiratory tract, is equipped with
The Correct Answer is {"dropdown-group-1":"B"}
A. Microvilli: Microvilli increase surface area for absorption (common in intestines), not the hallmark of respiratory epithelium
B. Cilia: Respiratory epithelium (pseudostratified ciliated columnar) is equipped with cilia on its free surface to move mucus and trapped particles
C. Keratin: Keratinization occurs in skin epithelium (protective), not in the typical respiratory lining
D. Desmosomes: Desmosomes are cell junctions found in many epithelia but the question asks about free-surface specializations; cilia are the functional free-surface structures in respiratory epithelium
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C"]
Explanation
A. They are thicker than arteries: veins generally have thinner walls (especially a thinner tunica media) than arteries because they carry blood at lower pressure.
B. Their tunica media is less developed than in arteries: veins have a thinner tunica media (less smooth muscle and elastic tissue) compared with arteries.
C. They often have one-way valves: many veins (especially in the limbs) have valves to prevent backflow and assist venous return against gravity.
D. They carry blood under very high pressure: veins return blood under low pressure; arteries carry blood under much higher pressure.
Correct Answer is A
Explanation
A. pepsin: pepsin (activated from pepsinogen) is the primary enzyme that begins protein digestion in the stomach.
B. amylase: amylase digests carbohydrates, primarily in the mouth/small intestine, not proteins in the stomach.
C. intrinsic factor: intrinsic factor (from parietal cells) is needed for vitamin B₁₂ absorption, not protein digestion.
D. lipase: lipase digests fats; gastric lipase plays a minor role but is not the main stomach protease.
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