MICROANATOMY

Detailed explanation-1: -Keratinocytes produce keratin, a tough, protective protein that makes up the majority of the structure of the skin, hair, and nails. The squamous cell layer is the thickest layer of the epidermis, and is involved in the transfer of certain substances in and out of the body.

Detailed explanation-2: -The uppermost layer of the skin epidermis is the stratum corneum. This layer is composed of flat, and tightly packed dead cells called keratinocytes. The layer of keratinocytes forms a waterproof barrier that protects the underlying skin layers from the penetration of external water.

Detailed explanation-3: -Hair is composed of 95% keratin, a fibrous and helical protein (in the shape of a helix), which is part of the composition of the skin and of all the phanera (hair, nails, etc.). Synthesized by keratinocytes, keratin is insoluble in water, thus ensuring waterproofing and protection for hair.