Name the innermost layer of an artery wall.
Tunica media
Tunica externa
Endothelium
Vasa vasorum
The Correct Answer is C
A. Tunica media: Middle layer made of smooth muscle and elastic fibers; not the innermost layer.
B. Tunica externa: Outermost connective-tissue layer (adventitia) that contains collagen and sometimes vasa vasorum; not the innermost.
C. Endothelium: The simple squamous cell lining that forms the innermost surface (part of the tunica intima).
D. Vasa vasorum: Small blood vessels that supply the walls of large vessels, located in the outer layers; not the innermost.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Decreased CO₂ and hydrogen ion concentrations and increased oxygen concentration stimulate her chemoreceptors, triggering inspiration. - Chemoreceptors respond to increased CO₂/decreased O₂.
B. The inflation reflex would not allow her to keep her lungs full of air for a prolonged period. The reflex would trigger inspiration. -The Hering–Breuer reflex prevents overinflation, not relevant here.
C. Increased CO₂ and hydrogen ion concentrations and decreased oxygen concentration stimulate her chemoreceptors, triggering inspiration. -Rising CO₂ strongly stimulates medullary chemoreceptors → involuntary breathing resumes.
D. The diaphragm will begin to fatigue and will not be able to hold its contracted position for more than a short period of time. -Breathing resumes due to chemoreceptor drive before muscle fatigue sets in.
Correct Answer is A
Explanation
A. Monocytes: Agranulocyte -large cell with a kidney/bean-shaped nucleus that differentiates into macrophages in tissues.
B. Neutrophils: Granulocyte -multilobed nucleus and cytoplasmic granules; primary phagocytes in acute inflammation.
C. Eosinophils: Granulocyte -bilobed nucleus with large eosin-staining granules; involved in parasitic infections and allergic reactions.
D. Basophils: Granulocyte -contains histamine/heparin-filled granules and participates in allergic/inflammatory responses.
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