______ burns involve only the epidermis.
partial thickness
First-degree
Second-degree
Third-degree
The Correct Answer is B
A. partial thickness: Partial-thickness burns extend into the dermis and can damage nerve endings, causing blisters and more intense pain. They are deeper than burns that affect only the epidermis.
B. First-degree: First-degree burns affect only the epidermis, causing redness, minor swelling, and pain. The deeper dermal structures remain intact, allowing for full recovery without scarring.
C. Second-degree: Second-degree burns involve both the epidermis and part of the dermis. They often produce blisters, severe pain, and potential scarring, making them more severe than first-degree burns.
D. Third-degree: Third-degree burns extend through the epidermis and dermis, potentially affecting underlying tissues. They may appear white, brown, or charred and often result in nerve destruction and permanent tissue damage.
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Related Questions
Correct Answer is C
Explanation
A. stratum basale:This is the deepest layer of the epidermis, consisting of mitotically active basal cells. Its main function is cell division and replacement of superficial layers, not the initiation of keratinization.
B. stratum lucidum:This clear layer is found only in thick skin, such as the palms and soles. It contains densely packed keratin, but keratinization has already occurred before this stage.
C. stratum spinosum:Cells in this layer begin producing keratin and keratohyalin, initiating the process of keratinization. The spiny appearance of the cells is due to desmosomal attachments, which help strengthen the epidermis.
D. stratum corneum:This outermost layer is composed of fully keratinized, dead cells. By this stage, keratinization is complete, and cells are flattened, providing a protective barrier.
Correct Answer is A
Explanation
A. elastic fibers:Elastic fibers are present in the skin, lungs, and blood vessel walls, providing resilience and the ability to stretch and recoil. In the skin, they maintain flexibility; in the lungs, they allow expansion and recoil during breathing; in blood vessels, they help accommodate pressure changes from blood flow.
B. reticular fibers:Reticular fibers form supportive networks in organs like the spleen, liver, and lymph nodes, but they are not a common feature of skin, lungs, or blood vessel walls.
C. simple squamous epithelium:Simple squamous epithelium is found lining blood vessels (endothelium) and alveoli in the lungs, but it is not present in the skin, so it is not a shared characteristic of all three tissues.
D. simple columnar epithelium:Simple columnar epithelium lines parts of the digestive tract and some glandular ducts but is absent from skin, lungs, and blood vessels, making it irrelevant as a shared feature.
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