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The protective external layer of tissue on the stem s and root s of woody trees and shrubs; includes all of the living and non-living tissue external to the cambium. basal Situated or attached at or close to the base (of a plant or a phylogenetic tree diagram). basifixed Something attached by its base, e.g. an anther attached to the filament.
The eccrine gland opens out through the sweat pore. The coiled portion is formed by two concentric layers of columnar or cuboidal epithelial cells. [8] The epithelial cells are interposed by the myoepithelial cells. Myoepithelial cells support the secretory epithelial cells. The duct of eccrine gland is formed by two layers of cuboidal ...
The root is covered with a special, usually 4- to 5-cell layer thick, [12] spongy tissue (called Velamen), which helps the plant to absorb moisture from the atmosphere. Epiphytic orchid have another sort of root, called clinging roots, that help the orchid plant cling to the substratum (host).
The layers usually incorporate a substance called conchiolin, often in order to help bind the calcium carbonate crystals together. Conchiolin is composed largely of quinone-tanned proteins. The periostracum and prismatic layer are secreted by a marginal band of cells, so that the shell grows at its outer edge.
Epithelium or epithelial tissue is a thin, continuous, protective layer of cells with little extracellular matrix. An example is the epidermis , the outermost layer of the skin . Epithelial ( mesothelial ) tissues line the outer surfaces of many internal organs , the corresponding inner surfaces of body cavities , and the inner surfaces of ...
1. Lining is an inner layer of fabric, fur, or other material that provides a neat finish; conceals seam allowances, interfacing, and construction details; and allows a garment to slip on and off easily. [18] [19] 2. The process of inserting a lining layer.
Tunica albuginea is a general term for a tunic of whitish connective tissue. In human anatomy, it generally is applied in three contexts: the fibrous sheath of the corpora cavernosa penis, the fibrous tunic of the testis, and the connective tissue tunic around the ovaries. [6] Tunica dartos is a muscular tunic beneath the skin of the scrotum ...
The cells comprising an epithelial layer are linked via semi-permeable, tight junctions; hence, this tissue provides a barrier between the external environment and the organ it covers. In addition to this protective function, epithelial tissue may also be specialized to function in secretion , excretion and absorption .