The epidermis of the skin consists of many layers of tightly packed cells. The outermost layer of cells are dead. Which best describes why this occurs?
A. Chemical compounds containing digestive enzymes are located on the outside of the skin, and they destroy the cells.
B. Blood vessels are not located in the epidermis, but in the underlying dermal connective tissue.
C. The outer layer of skin is nervous tissue and nervous tissue will not regenerate.
D. Pathogens on the skin secrete toxins that affect the cellular structure, thus destroying the cell.

Question

The epidermis of the skin consists of many layers of tightly packed cells. The outermost layer of cells are dead. Which best describes why this occurs? 
A. Chemical compounds containing digestive enzymes are located on the outside of the skin, and they destroy the cells.
B. Blood vessels are not located in the epidermis, but in the underlying dermal connective tissue.
C. The outer layer of skin is nervous tissue and nervous tissue will not regenerate.
D. Pathogens on the skin secrete toxins that affect the cellular structure, thus destroying the cell.

eclipsedstar · Answer

@pooja195 @Somy I think it's B.

somy · Answer

' The epidermis does not have a direct blood supply; all nutrients that feed these cells come from the dermis. Only the deepest cells of the stratum basale receive nourishment. The cells that are pushed away from this layer die. When the cells reach the skin surface, they are sloughed off in a process called desquamation. ' http://owh.adam.com/pages/guide/reftext/html/skin_sys_fin.html so yeah you are right :)

eclipsedstar · Answer

Ok thanks! ^_^~

somy · Answer

No problem :)