Multiple Choice
Which of the following lists the layers of the epidermis in order from deepest to most superficial?
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5. Integumentary System
The Epidermis: Layers
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Which layer of the skin lacks blood vessels (is avascular)?
A
Hypodermis (subcutaneous layer)
B
Epidermis
C
Dermis
D
Papillary layer of the dermis
Verified step by step guidance1
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 supplying 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 support the skin's metabolic needs 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 considered avascular, relying on diffusion from the underlying dermis for nutrient and waste exchange.
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