객관식
The epidermis of thick skin ranges between ______ millimeters thick.
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5. Integumentary System
The Epidermis: Layers
객관식
Which layer of the skin lacks blood vessels (is avascular)?
A
Epidermis
B
Papillary layer of the dermis
C
Dermis
D
Hypodermis (subcutaneous layer)
검증된 단계별 안내1
Understand the structure of the skin, which consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous layer).
Recall that blood vessels are responsible for delivering nutrients and oxygen to tissues, and their presence or absence defines whether a layer is vascular or avascular.
Identify that the dermis and hypodermis contain blood vessels, as they are involved in nutrient supply and thermoregulation.
Recognize that the epidermis is the outermost layer of the skin and is composed mainly of keratinized epithelial cells, which do not contain blood vessels.
Conclude that because the epidermis lacks blood vessels, it is avascular, relying on diffusion from the underlying dermis for nutrient and waste exchange.
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