NHA Phlebotomy Certification Practice Exam

Which layer of skin contains blood vessels?

1. Epidermis

2. Dermis

3. Keratinized epithelium

4. Root shaft

The correct answer is: Dermis

The dermis is the layer of skin that contains blood vessels and is located beneath the epidermis. This layer is primarily composed of connective tissue and is responsible for providing structural support and strength to the skin. The presence of blood vessels in the dermis allows for the supply of oxygen and nutrients to the skin and plays an essential role in thermoregulation, as these vessels can dilate or constrict to help regulate body temperature. Additionally, the dermis houses various other structures, including hair follicles, sweat glands, and nerve endings, making it critical for overall skin function and health. The epidermis, on the other hand, is the outermost layer of skin and does not contain blood vessels; it relies on the dermis for its nourishment through the process of diffusion. The keratinized epithelium refers to the outer layer of the epidermis where dead skin cells are found, and the root shaft pertains to structures associated with hair follicles, neither of which involves blood vessels.