Tattoos are permanent because the ink is injected into the _______________ layer of the integument.

Question

BlackTom AI · Accepted Answer

Tattoo ink resides in the dermis layer of the integument.

Relevant knowledge points and concepts:
- The integument (skin) has three main layers: epidermis (outermost), dermis (middle), and subcutaneous/hypodermis (deepest).
- The epidermis continually renews and sheds cells; the dermis is composed of stable connective tissue (collagen, elastin), blood vessels, fibroblasts, and resident immune cells; the hypodermis is mainly adipose tissue.
- Permanence of a tattoo depends on pigment particles being deposited into a relatively stable tissue compartment where they are not routinely shed.

Step-by-step reasoning:
1. Identify layers and their properties: epidermis = continuous turnover and shedding; dermis = stable extracellular matrix with long-lived cells; subcutaneous layer = fat and loose connective tissue.
2. Consider what “permanent” requires: pigment must remain where cells aren’t sloughed off; it must be held by tissue structures or phagocytic cells.
3. Determine ideal location: the dermis contains fibroblasts and extracellular matrix that trap pigment particles and resident macrophages that engulf but largely retain pigment, producing long-term visibility.
4. Conclude that pigment in the epidermis would be lost as keratinocytes are shed; pigment in the subcutaneous layer would diffuse, heal poorly, and blur.

Why the correct answer is correct:
- Dermal placement prevents pigment loss from normal epidermal turnover, and the dermis’ connective tissue and macrophages retain pigment particles for years, making tattoos effectively permanent.

Why the other options are incorrect:
- Epidermis: incorrect because its cells are constantly replaced and sloughed, so ink placed here would disappear.
- Subcutaneous layer: incorrect because it is deeper adipose tissue prone to diffusion and blurring and not the standard target for tattooing.
- Supercutaneous layer: not a standard anatomical layer; likely meant to mislead and is incorrect.

Final confirmation: The correct choice is Dermis, matching the provided answer.

Tattoos are permanent because the ink is injected into the _______________ layer of the integument.单项选择题

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