hair root definition
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- Hair root. Hair root. The part of a hair that is embedded in the hair follicle, its lower succulent extremity capping the dermal papilla pili in the deep bulbous portion of the follicle. Synonym: radix pili. Please contribute to this project, if you have more information about this term feel free to edit this page.
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Definitions &Translations Princeton's WordNet(4.25 / 8 votes)Rate this definition: root(noun) (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground. beginning, origin, root, rootage, source(noun) the place where something begins, where it springs into being.
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Root Hairs and its Surface Area root hairs and its surface area root hair a root hair the rhizoid of a vascular plant is a tubular outgrowth of a trichoblast a hair forming cell on the epidermis of a plant root as they are lateral extensions of a single cell and only rarely branched they are invisible to the naked eye
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- CHEM 107 Hair handout. 3-22-05 and 3-24-05 Basic Structure of Hair A hair can be defined as a slender, thread-like outgrowth from a follicle in the skin of mammals. Composed mainly of keratin, it has three morphological regions—the cuticle, medulla, and cortex.
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- Full Definitions of root 1 n (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground
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- Hair follicle: A sac from which a hair grows and into which the sebaceous (oil) glands open. The follicle is lined by cells derived from the epidermal (outside) layer of the skin.Each follicle normally goes through a five-year cycle of growth and rest, with about 90% of the follicles growing hair at any one time, averaging about six inches (15 cm) of growth per year.erived from the Latin word follis, for bag. The human hair follicle is a dynamic structure that generates hair through a complex and exquisitely regulated cycle of growth and remodelling governed by numerous genes, Siobh n A. Jordan has noted in Molecular Medicine Today.
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TOOTH (teeth) tooth root, root-the part of a tooth that is embedded in the jaw and serves as support. pulp-the soft inner part of a tooth. stump-the part of a limb or tooth that remains after the rest is removed.
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Hair For the epithet, see List of people known as the Hairy. Hair is a protein filament that grows from follicles found in the dermis, or skin. Hair is one of the defining characteristics of mammals. The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair.
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Definition of 'root' Definition of 'root'. root (ruːt ) The roots of a plant are the parts of it that grow under the ground. ...the twisted roots of an apple tree. If you root a plant or cutting or if it roots, roots form on the bottom of its stem and it starts to grow. Most plants will root in about six to eight weeks.
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root cap root cap. n. 1. (Botany) a hollow cone of loosely arranged cells that covers the growing tip of a root and protects it during its passage through the soil.
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What Are Hair Follicles? A hair follicle is a stocking-like structure that contains cells and connective tissue and surrounds the root of a hair. It exists within the dermis and the epidermis, the two top layers of the skin. For a helpful visual, think of the hair follicle as a vase and the hair as the stem of a flower.
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hair cell hair cell. n. A cell with hairlike processes, especially one of the sensory epithelial cells present in the organ of Corti. n. an epithelial cell having hairlike processes, as that of the organ of Corti.
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Root Hairs and its Surface Area root hair cell vary between 5 and 17 micrometers in diameter while the average cell is about 50 micrometers in diameter for plants the function of the root hairs is to collect large amounts of water nutrients and minerals in the soil for transportation to the other plants surface area to volume ratio
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Accessory Organs of the Skin 1 Hair is composed of the following structures: 2  The hair shaft is the portion of the hair that is visible on the surface of the skin.  The hair root is the portion of the hair that penetrates the skin (epidermis and dermis).
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- Differentiation within the outer root sheath proceeds along an axis that is parallel to the surface of the skin. The outer root sheath is thinnest at the level of the bulb and thickest in the middle portion of the hair follicle, causing the hair to be more or less eccentric in the follicle. Most of the follicles have some degree of swelling of the outer sheath on the side of bulge.
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hairpin Definition of hairpin. 1  1 : a pin to hold the hair in place; specifically : a long U-shaped pin. 2  2 : something shaped like a hairpin; specifically : a sharp U-shaped turn in a road.
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How hair grows How hair grows. Hair grows out of little pockets in your skin, called follicles. Your hair begins growing from a root in the bottom of the follicle. The root is made up of cells of protein. Blood from the blood vessels in your scalp feeds the root, which creates more cells and makes the hair grow.
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- root′ canal` ther`apy. n. 1. the branch of endodontics that treats disease of the dental pulp. 2. a treatment for such disease in which the pulp is removed and replaced by filling material.
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A-level Biology/Transport/multicellular plants A root hair is a simple extension of the epidermis of a root cell, and reach into the soil to absorb water. It exists to increase the surface area and therefore the rate at which water can be absorbed. Some plants have fungi which act like fine roots, absorbing nutrients from the soil for the plant.
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- A hair follicle is a mammalian skin organ that produces hair. Hair production occurs in phases, including growth (anagen), cessation (catagen), and rest (telogen) phases. Stem cells are responsible for hair production.
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- 2. that portion of an organ, such as a tooth, hair, or nail, that is buried in the tissues, or by which it arises from another structure, or the part of a nerve that is adjacent to the center to which it is connected. 1  Tooth anomalies with variations in root form. From Darby and Walsh, 1994.
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What is the function of hair? Hair follicle outer root sheath. Each hair follicle has an Outer Root Sheath (ORS), which surrounds the hair follicle like a sleeve all the way to the bulb, and is distinct from other epidermal components of the hair follicle. The outer root sheath is essentially a stratified epithelium that is contiguous with the epidermis.
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- Please try again later. Learn how to hide or show your phone number when you are making a call on the Samsung Galaxy S3. When your phone is in hidden mode, the other person who receives your call will not see your number, but it will show up as private number.
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Hair The root of the hair ends in an enlargement, the hair bulb, which is whiter in color and softer in texture than the shaft, and is lodged in a follicular involution of the epidermis called the hair follicle.
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- 3-22-05 and 3-24-05 Basic Structure of Hair A hair can be defined as a slender, thread-like outgrowth from a follicle in the skin of mammals. Composed mainly of keratin, it has three morphological regions—the cuticle, medulla, and cortex.
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- Medical Definition of HAIR FOLLICLE. : the tubular epithelial sheath that surrounds the lower part of the hair shaft and encloses at the bottom a vascular papilla supplying the growing basal part of the hair with nourishment.see hair illustration. See hair follicle defined for kids.ADVERTISEMENT.efinition of HAIR FOLLICLE. : the tubular epithelial sheath that surrounds the lower part of the hair shaft and encloses at the bottom a vascular papilla supplying the growing basal part of the hair with nourishment. see hair illustration.