Dermis

Science / Biology / Dermis: One of the two layers of skin; a connective tissue layer under the epidermis containing elastic and collagen fibers, capillary networks, and nerve endings.

Epidermis

Science / Biology / Epidermis: 1. The outermost layer of skin consisting of several layers of epithelial cells&emdash;notably, keratinocytes&emdash;and, in the inner layer of the epidermis, basal cells and melanocytes. 2. The outer MORE

Endodermis

Science / Biology / Endodermis: A layer of cells surrounding the vascular cylinder of plants. MORE

Plastids

Science / Biology / Plastids: Membrane-bound organelles in plant cells that function in storage (of food or pigments) or food production. Term for any double membrane-bound organelle. Chloroplasts contain the chemicals for photosy MORE

Palisade

Science / Biology / Palisade: Layer of mesophyll cells in leaves that are closely placed together under the epidermal layer of the leaf. Palisade parenchyma: Columnar cells located just below the upper epidermis in leaves the cell MORE

Trichomes

Science / Biology / Trichomes: Extensions from the epidermis of the plant that provide shade and protection for the plant. MORE

Melanin

Science / Biology / Melanin: A pigment that gives the skin color and protects the underlying layers against damage by ultraviolet light; produced by melanocytes in the inner layer of the epidermis. MORE

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