NEET PG DENTAL EXAM

HISTOLOGY

INTEGUMENTARY SYSTEM SKIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The waterproofing protein that fills the cells in the upper layers of the epidermis.
A
Keratin
B
Melatonin
C
Melanin
D
Actin
Explanation: 

Detailed explanation-1: -The epidermal cells are:-1-the keratinocytes: compose most of the epidermis. They produce a protein: the keratin that helps waterproof the skin and that protects the skin and the underlying tissues from heat, microbes, abrasion and chemicals.

Detailed explanation-2: -Keratinocytes. Keratinocytes are the predominant cell type of epidermis and originate in the basal layer, produce keratin, and are responsible for the formation of the epidermal water barrier by making and secreting lipids.

Detailed explanation-3: -The keratinocytes in the stratum spinosum begin the synthesis of keratin and release a water-repelling glycolipid that helps prevent water loss from the body, making the skin relatively waterproof.

Detailed explanation-4: -Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin gives skin its strength.

There is 1 question to complete.