Multiple Choice
Which of the following best describes the function of the arrector pili muscle associated with hair follicles?
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5. Integumentary System
Introduction to the Integumentary System
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Which letter indicates the integument layer that has no vascularization?
A
A. Epidermis
B
C. Hypodermis
C
D. Subcutaneous tissue
D
B. Dermis
Verified step by step guidance1
Understand the structure of the integumentary system, which consists of three main layers: the epidermis, dermis, and hypodermis (also referred to as subcutaneous tissue).
Recall that vascularization refers to the presence of blood vessels. Blood vessels are responsible for supplying nutrients and oxygen to tissues.
Identify the characteristics of each layer: The epidermis is the outermost layer and is composed primarily of keratinized epithelial cells. It does not contain blood vessels, relying on diffusion from the underlying dermis for nutrient exchange.
Contrast this with the dermis, which is highly vascularized and contains blood vessels, nerves, and connective tissue. The hypodermis (subcutaneous tissue) also contains blood vessels and serves as a cushion and energy reserve.
Conclude that the layer with no vascularization is the epidermis, as it lacks blood vessels entirely.
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