Cuticle

Cuticle is a term used in various branches of biology. In zoology, it refers to a multi-layered structure outside the epidermis of many invertebrates, notably roundworms and arthropods, and in botany, it refers to a protective film covering the epidermis of leaves, young shoots and other aerial plant organs.

Zoology

In zoology, the cuticle or cuticula is a multi-layered structure outside the epidermis of many invertebrates, notably roundworms and arthropods, including insects, spiders, and crustaceans. It provides protection, structural support, and a means of sensing the environment.

Structure

The cuticle is secreted by the underlying epidermis and is composed of proteins, chitin, and often calcium carbonate. It is periodically shed and re-grown during a process called moulting.

Botany

In botany, the cuticle is a water-impervious protective layer covering the epidermis of leaves, young shoots and other aerial plant organs. It consists of lipid and hydrocarbon polymers impregnated with wax, and is synthesized exclusively by the epidermal cells.

Function

The main function of the cuticle is to prevent water loss within the plant. It also provides a barrier to the entry of disease organisms and reduces the rate of penetration of potentially harmful solar radiation.

See also

• Epidermis (zoology)
• Epidermis (botany)
• Moulting
• Chitin
• Calcium carbonate

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