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BIOLOGY
Asked by Jeniffer

Which connective tissue composes the dermis of the skin?

The epidermis is the outermost layer of skin and underneath that sits the dermis. The dermis is linked to the epidermis via the basement membrane which controls the traffic of cells and molecules between the dermis and epidermis. The dermis provides tensile strength and elasticity to the skin through an extracellular matrix composed of collagen fibrils, microfibrils, and elastic fibres, embedded in hyaluronan and proteoglycans. Collagen fibrils: Collagen is made up of amino acids wound together in triple-helices structures to form of elongated fibrils. I always think of ropes when I think of collagen fibrils as they have a similar appearance. Microfibrils: as the name suggest is a very fine fibre like strand and is composed of glycoproteins and cellulose and it helps to increase the cell strength Elastic fibres: are bundles of elastin produced by fibroblasts and smooth muscle cells in arteries. These can stretch to 1.5x times their length without snapping, so help to provide cushioning.

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Claire Jeffrey

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