VEM 023 Integument Quiz

What is the primary cell type found in the epidermis?

• Melanocytes

• Keratinocytes

• Fibroblasts

• Adipocytes

Which cell type in the skin is correctly matched with its function?

• Melanocytes – antigen-presenting

• Langerhans cells – pigment-producing

• Merkel cells – tactile epithelial cells

• Adipocytes – immune function

How many layers does the epidermis of thick skin have?

• 4

• 6

• 5

• 3

What happens to melanin after it is produced by melanocytes?

• It forms the stratum corneum

• It circulates through dermal blood vessels

• It is converted into carotene

• It forms a protective cap over keratinocyte nuclei

Which type of melanin is responsible for dark brown to black pigmentation?

• Eumelanin

• Pheomelanin

• Carotene

• Hemoglobin

What causes albinism, a condition characterized by skin hypopigmentation?

• Defect in keratin production

• Overproduction of eumelanin

• Deficiency in vitamin D synthesis

• Defect in tyrosinase or the melanin-producing pathway

Which of the following best describes the reticular layer of the dermis?

• Loose connective tissue and blood vessels

• Dense irregular connective tissue with glands

• Stratified squamous epithelium

• Smooth muscle

What are hairs composed of, and where do they develop?

• Collagen fibers; in the dermis

• Elongated keratinized structures; in hair follicles

• Smooth muscle cells; in sebaceous glands

• Pigment cells; in sweat glands

Which muscle is responsible for pulling hair shafts to an erect position and causing goose bumps?

• Lateral arector muscle

• Medial erector muscle

• Arrector fili muscle

• Arrector pili muscle

Which layer of the skin contains the majority of blood vessels?

• Stratum corneum

• Dermis

• Hypodermis

• Stratum basale