Question at position 17 Which layer of the integumentary system is growing too thick and causing this condition?Subcutaneous layerEpidermisDermisClear my selection单项选择题
A
Subcutaneous layer
B
Epidermis
C
Dermis

Question

Question at position 17 Which layer of the integumentary system is growing too thick and causing this condition?Subcutaneous layerEpidermisDermisClear my selection

BlackTom AI · Accepted Answer

Epidermal hyperplasia or hyperkeratosis — an overproduction of keratinocytes — produces the obvious thickening of the outer skin surface seen in this condition.

1) Relevant knowledge points and concepts
- The integument has three main layers: epidermis (outer epithelial layer, includes keratinocytes and strata such as basale, spinosum, granulosum, corneum), dermis (connective tissue with blood vessels, nerves, glands), and subcutaneous layer (hypodermis: adipose tissue for insulation and cushioning).
- Surface thickening (callus, plaque, hyperkeratosis, psoriasis) results from increased proliferation/keratin accumulation in the epidermis, especially a thickened stratum corneum or expanded stratum spinosum/basale.

2) Step-by-step reasoning
- The visible thickened, scaly or rough area is made of epidermal cells (keratinized epithelium), not connective tissue or fat.
- Conditions that look like excess skin layers involve abnormal keratinocyte proliferation (epidermis). For example, a callus forms from repeated friction causing epidermal hyperplasia; psoriasis shows epidermal hyperproliferation and scale formation.
- Since the question asks which layer is “growing too thick,” we identify the layer capable of proliferative thickening that appears on the surface: the epidermis.

3) Calculations/intermediate steps
- No numeric calculations apply. Logical deduction: layer responsible for surface keratinized tissue = epidermis.

4) Why the correct answer is correct
- The epidermis is the cellular layer that can increase in cell number and keratin deposition, producing visible thickening of the skin surface. Hyperkeratosis and acanthosis are epidermal processes, so epidermal growth explains the condition.

5) Why the other options are incorrect
- Dermis: composed of collagen, blood vessels, nerves and does not create the horny outer layer; dermal thickening causes different signs (scarring, fibrosis) not an epidermal plaque.
- Subcutaneous layer (hypodermis): fatty tissue; expansion here produces bulging or cushioning changes, not a localized thickened horny surface.

6) Conclusion
Therefore, the epidermis is the layer growing too thick, matching the provided correct answer: Epidermis.

Question at position 17 Which layer of the integumentary system is growing too thick and causing this condition?Subcutaneous layerEpidermisDermisClear my selection单项选择题

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