Anatomy & Physiology Integumentary #8
Which layer of the epidermis is the location where the process of surface keratin formation begins?
- Stratum basale
The stratum basale is a single layer of columnar cells. Keratin formation does not begin in this layer of the epidermis.
- Stratum corneum
While keratin is contained in the stratum corneum, this is not the layer of the epidermis where keratin formation begins.
- Stratum spinosum
Cells in stratum spinosum are rich in ribonucleic acid (RNA); therefore, they are well equipped to initiate the protein synthesis that is required for the production of keratin. However, surface keratin formation does not begin here.
- Stratum granulosum
The process of surface keratin formation begins in the stratum granulosum. Keratohyalin is located within the cells of this layer of the epidermis and are required for the formation of surface keratin.
Keratin protects the skin from dehydration and its formation begins in the epidermis.
The cells of the epidermis are found in five distinct layers, or strata. Each layer is named for its functional or structural characteristics. The strata of the epidermis are listed below in order from most superficial to the deepest. The layers are as follows:
Surface keratin formation begins in the stratum granulosum.
Test Taking Tip
Try to eliminate choices as incorrect based on your knowledge. By doing this, you will not be guessing randomly but will be exercising “informed guessing.”