RN exams medical-surgical practice questions set 24

Correct answer:

Accessory components of the skin are structures derived from the epidermis, enhancing its function. Nails, formed from keratinized epidermal cells at the nail matrix, protect fingertips. Hair, also epidermal, grows from follicles, aiding sensation and insulation. Mammary glands, modified sweat glands of epidermal origin, produce milk and are considered integumentary appendages. Subcutaneous tissue (hypodermis), however, is not an accessory structure; it's a connective tissue layer beneath the dermis, composed of adipose and areolar tissue, anchoring skin to underlying structures and storing fat. While integral to the integumentary system, it's mesoderm-derived, not an epidermal appendage like nails, hair, or glands. Anatomical definitions classify accessory structures as epidermis-derived, excluding the hypodermis, which supports rather than extends skin function, clarifying its distinct role.

Correct answer:

Accessory components of the skin are structures derived from the epidermis, enhancing its function. Nails, formed from keratinized epidermal cells at the nail matrix, protect fingertips. Hair, also epidermal, grows from follicles, aiding sensation and insulation. Mammary glands, modified sweat glands of epidermal origin, produce milk and are considered integumentary appendages. Subcutaneous tissue (hypodermis), however, is not an accessory structure; it's a connective tissue layer beneath the dermis, composed of adipose and areolar tissue, anchoring skin to underlying structures and storing fat. While integral to the integumentary system, it's mesoderm-derived, not an epidermal appendage like nails, hair, or glands. Anatomical definitions classify accessory structures as epidermis-derived, excluding the hypodermis, which supports rather than extends skin function, clarifying its distinct role.

Correct answer:

The development of autoantibodies such as antinuclear antibodies (ANA) and anti-double-stranded DNA (anti-dsDNA) antibodies in systemic lupus erythematosus (SLE) is primarily attributed to a loss of self-tolerance. Self-tolerance refers to the immune system's ability to recognize and differentiate self-antigens from foreign antigens. In individuals with SLE, there is a breakdown in immune tolerance mechanisms, leading to the production of autoantibodies against self-antigens like nuclear components (e.g., DNA, RNA, histones). This loss of self-tolerance results in the immune system targeting and attacking its tissues, leading to the systemic inflammation and tissue damage characteristic of SLE. The presence of elevated levels of ANA and anti-dsDNA antibodies in this patient suggests an autoimmune response against nuclear material, further supporting the role of self-tolerance breakdown in SLE

Correct answer:

The correct answer is B: Use pulse oximetry to assess the client's oxygen saturation. The bluish tinge, known as cyanosis, indicates decreased oxygen saturation in the blood. Using pulse oximetry will provide objective data on the client's oxygen levels. This is crucial in determining the severity of hypoxemia and guiding further interventions. Choice A: Asking about medications is not the immediate priority when cyanosis is detected. Medications may be relevant but do not address the urgent need for assessing oxygen saturation. Choice C: Auscultating lung fields is important in assessing respiratory status, but it does not directly address the need to determine the client's oxygen saturation level. Choice D: Palpating pulses can provide information on perfusion, but it does not directly assess the client's oxygenation status, which is the immediate concern when cyanosis is present.

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Two,' because the skin comprises two primary layers the epidermis and dermis excluding the subcutaneous tissue layer, which is beneath the skin proper. The epidermis, the outermost layer, acts as a waterproof barrier and protects against pathogens, while the dermis, below it, houses blood vessels, nerves, and glands, providing strength and elasticity. The subcutaneous layer, or hypodermis, is a separate entity of fat and connective tissue, not counted as a skin layer but as underlying support. 'One' is incorrect, as it ignores the dermis. 'Three' might confuse the subcutaneous layer as a skin layer, which it isn't in standard terminology. 'Four' exceeds the anatomical structure entirely. This distinction is vital in nursing for assessing skin integrity and wounds, as each layer's condition affects healing and care strategies, making 'Two' the accurate choice based on established skin anatomy.

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Rationale for choice C: Interleukins are chemicals that facilitate communication between leukocytes, aiding in the stimulation of immunity. This is accurate because interleukins play a crucial role in regulating immune responses and coordinating interactions between different immune cells. They help in the activation, proliferation, and differentiation of leukocytes, thereby enhancing the body's immune defense mechanisms. Summary of other choices: A: Incorrect. Interleukins are not specifically related to responses against viral infections, but rather play a broader role in immune regulation. B: Incorrect. Interleukins generally do not block inflammatory reactions; instead, they often promote immune responses. D: Incorrect. While interleukins do bind to specific receptors, their functions are not limited to responding to very specific situations, but rather involve broader immune regulation.

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The correct answer is C: Increasing the amount of intravenous (IV) lactated Ringer's solution administered per hour. This is the most appropriate action to address the client's hypovolemia due to burn injury. The client's low blood pressure, tachycardia, and decreased urine output indicate inadequate fluid resuscitation. Increasing the IV fluid rate will help improve perfusion and fluid balance. Option A (Transfusing 1 unit of packed red blood cells) is incorrect because the client's low blood pressure is likely due to hypovolemia rather than anemia. Option B (Administering a diuretic to increase urine output) is contraindicated as the client is already hypovolemic and needs fluid resuscitation. Option D (Changing the IV lactated Ringer's solution to one that contains 5% dextrose in water) is not appropriate as the primary concern is to address hypovolemia rather than providing additional

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The correct answer is B: IgE. In Type I hypersensitivity reactions, IgE antibodies are involved. Firstly, upon initial exposure to an allergen, B cells produce IgE antibodies specific to that allergen. IgE antibodies then bind to mast cells and basophils. Upon subsequent exposure to the same allergen, it cross-links the IgE antibodies on mast cells and basophils, leading to degranulation and release of inflammatory mediators like histamine. This results in the symptoms of Type I hypersensitivity reactions. Choice A (IgA) is incorrect because IgA is mainly involved in mucosal immunity. Choice C (IgG) is incorrect because while IgG can be involved in Type II and Type III hypersensitivity reactions, it is not the primary antibody in Type I hypersensitivity. Choice D (IgM) is incorrect because IgM is typically involved in the primary immune response, not in Type I hypersensitivity reactions.

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Aging skin's fragility stems from structural shifts, with 'decreased size of rete ridges' best explaining skin tear risk. Rete ridges epidermal-dermal junctions flatten with age e.g., from 0.2 mm to 0.1 mm reducing adhesion, per Baranoski and Ayello (2004), so minor shear (e.g., tape removal) tears skin. , 'increased epidermal migration,' is false; it slows e.g., healing drops 50% not aiding tears. , 'increased sebum,' reverses; secretion falls e.g., 20% less oil drying skin but not tearing it. , 'decreased dermal thickness,' thins skin e.g., 0.5 mm over tibia vs. 1 mm young but pressure ulcers, not tears, rise here. An 80-year-old's paper-thin arm e.g., 70% tear incidence shows rete ridge loss trumps thickness for tears, a nurse's assessment key in geriatrics. Unlike pressure risk over bones, tears exploit epidermal detachment, per *Wound Care Essentials*, making the precise, primary cause.

Correct answer:

The correct answer is B. The symptoms described by the client, excessive diaphoresis and feeling warm at night, are characteristic of perimenopause. During this period, lower estrogen levels lead to surges in follicle-stimulating hormone (FSH) and luteinizing hormone (LH), resulting in vasomotor instability, night sweats, and hot flashes. Therefore, discussing perimenopause and related comfort measures with the client is essential to provide education and support. Choice A is incorrect because explaining the effects of FSH and LH alone does not directly address the client's current symptoms. Choice C is irrelevant as it focuses on assessing lung fields and cough symptoms, which are not related to the client's menopausal symptoms. Choice D is not the best response as it is more focused on ruling out fever as a cause, which is not typically associated with the symptoms described by the client.