Question

question 16
the layer of the epidermis that includes melanocytes and a single row of cells that undergo mitosis is the:
a stratum spinosum
b stratum granulosum
c stratum corneum
d stratum basale

Explanation:

• Stratum basale: It is the deepest layer of the epidermis. It contains melanocytes (which produce melanin) and a single row of keratinocytes that undergo mitosis (cell division) to produce new cells. As new cells are formed, they push older cells upward through the other layers of the epidermis.
• Stratum spinosum: Consists of several layers of polyhedral cells with prominent intercellular bridges (desmosomes). It is mainly involved in providing strength and flexibility to the skin.
• Stratum granulosum: Cells in this layer contain keratohyalin granules. As cells move into this layer, they begin to degenerate and lose their nuclei.
• Stratum corneum: The outermost layer of the epidermis, composed of dead, flattened keratinized cells. Its main function is to provide a barrier against the environment.

Answer:

D. stratum basale