NEET PG DENTAL EXAM

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HISTOLOGY

INTEGUMENTARY SYSTEM SKIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
As cells are pushed from the deeper portion of the epidermis toward the surface, ____
A
they fill with keratin and die
B
they divide
C
their nutrient supply increases
D
they enter the dermis
Explanation: 

Detailed explanation-1: -As they move towards surface to make way for new cells, they receive less amount of nutrition, and due to accumulation of more of keratin the cells become metabolically inactive. Evevtually dead cells form superficial stratum corneum. Skin epidermis is ectodermal tissue.

Detailed explanation-2: -From there the keratinocytes move into the next layer, called the stratum granulosum. This layer gets its name from the fact that the cells located here contain many granules. The keratinocytes produce a lot of keratin in this layer-they become filled with keratin. This process is known as keratinization.

Detailed explanation-3: -As they move from the deeper epidermal layers to the surface, the keratinocytes change shape and chemical composition, through the process called keratinization, where the cells accumulate keratin.

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