LPN exams medical-surgical practice questions set 2

Correct answer:

During embryonic development, the integumentary system's layers arise from distinct germ layers. The epidermis, the outer skin layer, forms from the ectoderm, the outermost embryonic layer responsible for external structures like skin, hair, and nails. Ectodermal cells differentiate into stratified squamous epithelium, eventually keratinizing for protection. The dermis, beneath the epidermis, develops from the mesoderm, the middle germ layer that generates connective tissues, muscles, and blood vessels. Mesodermal cells form the dermis's collagen, elastic fibers, and vascular network, supporting the epidermis. The endoderm, forming internal linings like the gut, contributes neither to the epidermis nor dermis. Reversing the layers (mesoderm for epidermis, ectoderm for dermis) contradicts embryology, as does involving endoderm. This ectoderm-mesoderm pairing reflects their specialized roles ectoderm for barrier formation, mesoderm for structural support consistent with developmental biology and the integument's dual-layer functionality.

Correct answer:

The correct answer is D because in this scenario, the patient presents with signs suspicious of aortic injury, indicated by the widened mediastinum on chest x-ray. However, the definitive test for aortic injury is a CT scan of the chest, which is more sensitive and specific than contrast angiography. If the CT scan is normal, it effectively rules out aortic injury, making further imaging with contrast angiography unnecessary. Performing angiography in this case would expose the patient to unnecessary risks without providing additional diagnostic value. Therefore, the correct approach is to first perform a CT scan of the chest, and if it is normal, no further imaging is required. Choice A is incorrect as contrast angiography is indicated in suspected aortic injury cases. Choice B is incorrect as performing contrast angiography after a CT scan would be redundant and expose the patient to unnecessary risks. Choice C is incorrect as the accuracy of contrast angiography in diagnosing aortic rupture is not as high as indicated in the

Correct answer:

A burn involving the epidermis and part of the dermis is classified as a partial-thickness burn, making choice B the correct answer. This type of burn typically presents with blisters, significant pain due to exposed nerve endings, and redness as blood vessels in the dermis are affected. It may heal spontaneously within two to three weeks with proper care or require skin grafting if deeper layers are involved. Superficial burns only affect the epidermis, causing mild pain and erythema without blisters, and heal quickly within days without scarring. Full-thickness burns extend through the epidermis, dermis, and into underlying tissues like fat or muscle, resulting in a charred appearance, no pain due to nerve destruction, and the need for surgical intervention. Deep partial-thickness burns involve most of the dermis, presenting with white or red skin and severe pain, often requiring grafting due to slower healing. The distinction lies in the depth of tissue involvement, and partial-thickness best matches the description provided.

Correct answer:

A burn involving the epidermis and part of the dermis is classified as a partial-thickness burn, making choice B the correct answer. This type of burn typically presents with blisters, significant pain due to exposed nerve endings, and redness as blood vessels in the dermis are affected. It may heal spontaneously within two to three weeks with proper care or require skin grafting if deeper layers are involved. Superficial burns only affect the epidermis, causing mild pain and erythema without blisters, and heal quickly within days without scarring. Full-thickness burns extend through the epidermis, dermis, and into underlying tissues like fat or muscle, resulting in a charred appearance, no pain due to nerve destruction, and the need for surgical intervention. Deep partial-thickness burns involve most of the dermis, presenting with white or red skin and severe pain, often requiring grafting due to slower healing. The distinction lies in the depth of tissue involvement, and partial-thickness best matches the description provided.

Correct answer:

The dermis owes its strength primarily to collagen, a robust protein forming a dense network of fibers. Collagen, the most abundant protein in the body, provides tensile strength, resisting stretching and tearing, which is crucial for the skin's durability as a protective barrier. Elastic fibers, also in the dermis, contribute flexibility, allowing the skin to return to shape after stretching, but they are less abundant and weaker than collagen. Together, they enhance dermal integrity, but strength is collagen's dominant contribution, as seen in its thick bundles in the reticular dermis. The 'both' option acknowledges their combined roles, but the question emphasizes strength, not elasticity, tilting the focus to collagen. 'None of these' dismisses both, which is inaccurate given collagen's established role. In conditions like Ehlers-Danlos syndrome, collagen defects weaken skin, underscoring its importance. Thus, collagen stands out as the primary fiber for dermal strength, aligning with anatomical and biomechanical evidence.

Correct answer:

The correct answer is D: Verifies that the client has given informed consent. Before performing any invasive procedure like a bone marrow aspiration, it is crucial for the nurse to ensure that the client has given informed consent. This involves explaining the procedure, risks, benefits, and alternatives to the client, allowing them to ask questions, and obtaining their signature on the consent form. This step is essential to ensure the client understands the procedure and willingly agrees to it. Choice A is incorrect because cleaning the biopsy site with an antiseptic should be done in the treatment room, not before taking the client there. Choice B, holding the client's hand and asking about concerns, is a good practice for providing emotional support but does not address the necessary step of verifying informed consent. Choice C, reviewing the client's platelet count, is important for assessing the client's readiness for the procedure but does not address the consent aspect, which is crucial before any invasive procedure.

Correct answer:

The correct answer is C because the patient experiencing a loss of consciousness immediately following the injury, regaining consciousness quickly, and then losing consciousness again is indicative of an epidural hematoma. This pattern is known as the "lucid interval," where the initial impact causes bleeding between the skull and dura mater, leading to a temporary improvement in symptoms before the hematoma expands, causing increased intracranial pressure and loss of consciousness. Choice A (Goose egg' noted on patient's head) is not specific to epidural hematoma and can occur in various head injuries. Choice B (The patient is unconscious when you arrive on the scene and remains that way throughout transport) is more indicative of a severe traumatic brain injury with continuous loss of consciousness rather than the characteristic pattern of an epidural hematoma. Choice D (Sudden, severe headache) is more commonly associated with subarachnoid hemorrhage or traumatic brain injury but not specifically with epidural hematoma.

Correct answer:

The dermis owes its strength primarily to collagen, a robust protein forming a dense network of fibers. Collagen, the most abundant protein in the body, provides tensile strength, resisting stretching and tearing, which is crucial for the skin's durability as a protective barrier. Elastic fibers, also in the dermis, contribute flexibility, allowing the skin to return to shape after stretching, but they are less abundant and weaker than collagen. Together, they enhance dermal integrity, but strength is collagen's dominant contribution, as seen in its thick bundles in the reticular dermis. The 'both' option acknowledges their combined roles, but the question emphasizes strength, not elasticity, tilting the focus to collagen. 'None of these' dismisses both, which is inaccurate given collagen's established role. In conditions like Ehlers-Danlos syndrome, collagen defects weaken skin, underscoring its importance. Thus, collagen stands out as the primary fiber for dermal strength, aligning with anatomical and biomechanical evidence.

Correct answer:

The dermis owes its strength primarily to collagen, a robust protein forming a dense network of fibers. Collagen, the most abundant protein in the body, provides tensile strength, resisting stretching and tearing, which is crucial for the skin's durability as a protective barrier. Elastic fibers, also in the dermis, contribute flexibility, allowing the skin to return to shape after stretching, but they are less abundant and weaker than collagen. Together, they enhance dermal integrity, but strength is collagen's dominant contribution, as seen in its thick bundles in the reticular dermis. The 'both' option acknowledges their combined roles, but the question emphasizes strength, not elasticity, tilting the focus to collagen. 'None of these' dismisses both, which is inaccurate given collagen's established role. In conditions like Ehlers-Danlos syndrome, collagen defects weaken skin, underscoring its importance. Thus, collagen stands out as the primary fiber for dermal strength, aligning with anatomical and biomechanical evidence.

Correct answer:

The primary characteristic of an autoimmune disease is that the immune system attacks the body's own healthy tissues. This is because in autoimmune diseases, the immune system mistakenly identifies normal cells and tissues as foreign invaders and mounts an immune response against them. This leads to inflammation, tissue damage, and various symptoms of the autoimmune disease. Incorrect choices: A: The immune system failing to recognize foreign pathogens is not the primary characteristic of an autoimmune disease. Autoimmune diseases involve the immune system mistakenly attacking the body's own tissues. C: While an overactive immune system producing excessive antibodies can be a feature of some autoimmune diseases, it is not the primary characteristic. The key feature is the immune system attacking healthy tissues. D: An immune system that is suppressed and cannot fight infections effectively is not characteristic of autoimmune diseases. Autoimmune diseases involve an immune system that is active but targeting the wrong cells.