Questions: The layer of stem cells that constantly divide to renew the epidermis is the stratum corneum. stratum germinativum. papillary layer. basal lamina. stratum granulosum.

The answer is the second one: stratum germinativum.

Explanation for each option:

1. Stratum corneum: This is the outermost layer of the epidermis, composed of dead keratinized cells. It does not contain stem cells and does not divide to renew the epidermis.
2. Stratum germinativum: Also known as the stratum basale, this is the deepest layer of the epidermis. It contains stem cells that constantly divide to produce new cells, which then move up through the layers of the epidermis.
3. Papillary layer: This is a layer of the dermis, not the epidermis. It contains blood vessels and nerves but does not contain stem cells for renewing the epidermis.
4. Basal lamina: This is a layer of the basement membrane that separates the epidermis from the dermis. It provides structural support but does not contain stem cells.
5. Stratum granulosum: This is a layer of the epidermis above the stratum spinosum. It contains cells that are in the process of dying and becoming keratinized, but it does not contain stem cells.

Summary: The layer of stem cells that constantly divide to renew the epidermis is the stratum germinativum.