Emergency Medical Technician (EMT) Intermediate Practice Exam

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Prepare for your EMT Intermediate Test. Study with detailed flashcards and multiple-choice questions, each featuring hints and explanations. Ace your exam!

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Which statement about the dermal layer of skin is true?

It does not contain nerve endings
Blood vessels do not penetrate into the epidermis
It is composed mainly of fatty tissues
It is entirely responsible for skin color

The correct answer is: Blood vessels do not penetrate into the epidermis

The statement that blood vessels do not penetrate into the epidermis is true. The skin is composed of two primary layers: the epidermis, which is the outermost layer, and the dermis, which lies beneath the epidermis. The dermis contains blood vessels, nerves, and connective tissue, while the epidermis is mainly made up of keratinized cells and does not have its own blood supply. Instead, it receives nutrients and oxygen through diffusion from the blood vessels in the dermis. This anatomical separation explains why the dermis provides the supportive structure and nourishment that the epidermis requires but does not itself contain blood vessels directly. The other statements regarding the dermal layer either misrepresent its composition, the role of nerve endings, or its function in skin pigmentation. Fatty tissues are primarily found in the hypodermis, which is beneath the dermis, and skin color is determined by various factors, including melanin produced in the epidermis, not solely by the dermis.