Which statement describes the trachea?
It is lined with simple squamous epithelium.
It contains no air-filtering mechanisms.
It is comprised of C-shaped cartilage rings.
It is a passageway for food and for air.
The Correct Answer is C
A. It is lined with simple squamous epithelium: The trachea is lined with pseudostratified ciliated columnar epithelium, not simple squamous
B. It contains no air-filtering mechanisms: the trachea has mucus and ciliated cells that trap and move particles (air-filtering mechanisms present)
C. It is comprised of C-shaped cartilage rings: The trachea is supported anteriorly by C-shaped hyaline cartilage rings that keep the airway open
D. It is a passageway for food and for air: The trachea is only an air passageway; the esophagus transports food
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Endocardium: The endocardium is the inner endothelial lining of the heart chambers (endothelium + connective tissue), not cardiac muscle, so it does not contain intercalated discs.
B. Parietal pericardium: The parietal pericardium is the outer layer of the serous/fibrous sac surrounding the heart (protective membrane), not muscle tissue, so it lacks intercalated discs.
C. Epicardium: The epicardium (visceral layer of serous pericardium) covers the heart surface and contains connective tissue and fat; it overlies the myocardium but is not the muscle layer itself, so it does not have intercalated discs.
D. Myocardium: The myocardium is the heart’s muscular wall composed of cardiac muscle cells that are connected by intercalated discs (for electrical and mechanical coupling).
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.
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