What statement describes a macule?
A small deep linear crack or tear in the skin
A flat lesion of a different color than normal skin
An elevated thin-walled lesion containing clear fluid
A palpable elevated lesion that varies in size
The Correct Answer is B
Rationale:
A. This describes a fissure, which is a linear tear or crack in the skin, often caused by dryness, trauma, or infection. Fissures are not flat and involve disruption of the skin surface, unlike a macule.
B. A macule is a small, flat, non-palpable area of skin that is different in color from the surrounding tissue. Examples include freckles, flat moles, or certain rashes. Macules are usually less than 1 cm in diameter and do not involve elevation or fluid accumulation.
C. This describes a vesicle, which is raised and fluid-filled. Vesicles are seen in conditions like chickenpox, herpes simplex, or contact dermatitis. Unlike macules, vesicles are palpable and elevated.
D. This describes a papule or nodule, which is solid, raised, and can vary in size. Examples include warts or small skin tumors. Macules are flat and non-palpable, so this description does not fit.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale:
A. This action is primary prevention, aimed at preventing exposure to lead before any adverse effects occur. It focuses on reducing hazards in the environment rather than detecting or treating early disease.
B. This is also primary prevention, targeting broad population-level strategies to reduce environmental hazards and prevent health problems before they occur.
C. Secondary prevention focuses on early detection and intervention to minimize the effects of exposure. Monitoring workers for chemical exposure allows early identification of overexposure, enabling interventions such as reducing contact, using protective equipment, or medical evaluation to prevent disease progression. This aligns with the goal of secondary prevention: screening and early detection of health problems.
D. Cleaning up toxic sites is primary prevention, removing hazards before exposure occurs. It prevents disease rather than detecting it early.
Correct Answer is B
Explanation
Rationale:
A. While antibodies can interact with immune cells, their main role is not to directly signal a cellular response. That function is primarily carried out by cytokines and T-helper cells in cell-mediated immunity.
B. Antibodies, also called immunoglobulins, are proteins produced by B lymphocytes that specifically recognize and bind to antigens. Once bound, antibodies can neutralize pathogens, mark them for destruction by phagocytes (opsonization), or activate the complement system, leading to lysis of the pathogen. Each antibody is highly specific to a particular antigen, which ensures targeted immune defense.
C. Inflammation is mainly initiated by mast cells, basophils, histamine, and cytokines, not directly by antibodies. Antibodies may enhance inflammation by activating complement or recruiting immune cells, but this is a secondary effect, not their primary role.
D. Antibodies are part of the adaptive immune response, but they do not activate the immune system on their own. Activation involves antigen presentation, T-cell activation, and cytokine signaling.
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