Question

As a student in an esthetic program, Hannah is tasked with building a three-dimensional model of the layers of the skin. Her model must include captions describing each skin layer and connect skin histology and physiology to esthetics. Hannah visits a craft store to purchase supplies from which she will construct her model.

Hannah adds a caption to the stratum _____ to indicate that the keratinized cells in this layer move to the surface to replace those shed from the stratum corneum.

a) Basale
b) Spinosum
c) Granulosum
d) Corneum

Answer 1

Hannah's skin model should label the stratum granulosum as the layer where keratinized cells move up to replace the cells shed from the surface stratum corneum.

Step-by-step explanation:

Hannah should add a caption to the stratum granulosum to indicate that the keratinized cells in this layer move to the surface to replace those shed from the stratum corneum. In the stratum granulosum, keratinocytes become filled with keratin and start to die, forming part of the barrier that protects the skin. Eventually, these cells are pushed up to become the stratum corneum, which is the outermost protective layer that sheds periodically. The stratum corneum consists of dead, keratinized cells that are replaced approximately every 4 weeks by cells pushing upward from the stratum granulosum.