The layer of the epidermis that contains the cells undergoing mitosis is the stratum

A. stratum basale:This is the deepest layer of the epidermis, consisting of mitotically active basal cells. Its main function is cell division and replacement of superficial layers, not the initiation of keratinization.

B. stratum lucidum:This clear layer is found only in thick skin, such as the palms and soles. It contains densely packed keratin, but keratinization has already occurred before this stage.

C. stratum spinosum:Cells in this layer begin producing keratin and keratohyalin, initiating the process of keratinization. The spiny appearance of the cells is due to desmosomal attachments, which help strengthen the epidermis.

D. stratum corneum:This outermost layer is composed of fully keratinized, dead cells. By this stage, keratinization is complete, and cells are flattened, providing a protective barrier.

A. Mature adipose cells are highly mitotic:Mature adipocytes do not actively divide. Instead, new adipocytes are formed from precursor cells, and mature ones primarily increase in size rather than number.

B. Its primary function is to store triglycerides:Adipose tissue serves mainly as an energy reservoir by storing triglycerides. It also provides insulation, cushioning, and contributes to endocrine functions by releasing hormones like leptin.

C. Most of the cell volume is occupied by the nucleus:In adipocytes, the nucleus is pushed to the periphery of the cell by a large lipid droplet. The majority of the cell volume is taken up by stored fat, not the nucleus.

D. It is composed mostly of extracellular matrix:Unlike connective tissues such as bone or cartilage, adipose tissue has relatively little extracellular matrix. The tissue is mainly composed of densely packed fat cells.