Keratinocytes

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INCORRECT

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Which of the following cell types provides a waterproofing function for the outer layers of skin?

Melanocytes

Melanocytes are pigment cells found in lowest layer of the epidermis of skin, the basal layer. They produce melanin, a pigment that absorbs UV light. They do not provide a waterproofing function for the skin.

Keratinocytes

Keratinocytes contain the protein keratin. They are produced in the epidermis and migrate upwards. The tight junctions between cells prevent water entry. They eventually form a layer of dead cells on the skin surface, which produces a waterproofing effect.

Merkel cells

MY ANSWER

Merkel cells are integumentary cells that work as mechanoreceptors and sense touch and pressure. They do not provide a waterproofing function for the skin.

Langerhans cells

Langerhans are dendritic cells of the immune system and are found in the lower layers of the epidermis. They immunologically process material that enters through the skin. They do not provide a waterproofing function for the skin.