Skin Biology

Our skin is made up of 2 layers dermis and epidermis. The upper layer of the skin which is the surface of skin is called the epidermis and the underlying layer is known as dermis. Skin is the largest organ in our body and is approximately 20 square feet in length, it is composed of 70% water.

The epidermis is a thin layer of skin which is approximately of 1 millimeter thickness, this layer of skin is thickest at the soles and palms. However, it is thinnest under the eyes hence any sign of stress or improper diet first shows up under the eyes, the skin gets dark.

The epidermis has 3 types of cells namely Keratinocytes, Melanocytes and Langerhans cells. Keratinocytes are responsible for producing the protein called Keratin, our hair is made up of this protein.

Melanocytes produce melanin which saves our skin from the UV rays of skin, melanin also determines the colour of our skin. Langerhans cells are a part of the immune system and protect our us from foreign particles that can pass through the skin. The epidermis has many nerve endings, as a result it gives us a sense of touch.

The dermis is a thick layer of skin and is made up of connective tissues which are supple and sturdy. This layer of skin contains cells like elastin and collagen which are known to give firmness and improve the texture of the skin. Though some cosmetic products include collagen or elastin in their skin care products but neither collagen nor elastin can penetrate into the skin.

So don’t waste money on these products. Dermis also contains sweat glands and sebaceous glands, sweat glands are important to keep the body cool and sebaceous glands produce sebum which acts as a natural protective covering for skin and hair. Dermis also supports blood vessels and tiny lymphs.

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