Which statement best describes a CT scan?
creates cross-sectional images by the use of x-ray technology and a computer
uses radioactive substances to produce an x-ray image
gives vertical front to back images of the body organs
magnetic field and radio waves are used to create an image
The Correct Answer is A
A. creates cross-sectional images by the use of x-ray technology and a computer: A CT (computed tomography) scan uses x-rays taken from many angles and a computer to reconstruct cross-sectional (axial) images.
B. uses radioactive substances to produce an x-ray image: This describes nuclear medicine techniques (e.g., PET or bone scan) that use radiotracers - not a CT.
C. gives vertical front to back images of the body organs: “Front to back” (coronal) or “vertical” views can be reconstructed from CT data, but CT is best described as producing cross-sectional (axial) images.
D. magnetic field and radio waves are used to create an image: This describes MRI (magnetic resonance imaging), not CT.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. acute: A short-term illness with rapid onset, high fever and severe pain fits the definition of acute - sudden onset, relatively brief duration.
B. latent: Latent means hidden or in an incubation/dormant phase (no/minimal symptoms), not a rapidly symptomatic illness.
C. chronic: Chronic refers to long-lasting or recurrent conditions, not short-term, rapidly severe illness.
D. secondary: Secondary describes an illness that results from or follows another condition - it’s a causal qualifier, not a time-course descriptor.
E. manifestation: A manifestation is a sign or symptom of disease, not a type of illness itself.
Correct Answer is A
Explanation
A. degranulation: Mast cells initiate inflammation by degranulation, releasing histamine, heparin and other mediators that increase vascular permeability and vasodilation.
B. opsonization: Opsonization is tagging pathogens (by antibodies or complement) to enhance phagocytosis - not how mast cells initiate inflammation.
C. endocytosis: Endocytosis is cellular uptake of material; mast-cell–mediated initiation of inflammation occurs via mediator release, not endocytosis.
D. chemotaxis: Chemotaxis is directional migration of leukocytes toward chemical signals; mast-cell mediators promote chemotaxis but the initiating action is degranulation.
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