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hair in Biological Definition

Albinism

... white skin which makes them stand out. Sometimes hair pigmentation is not completely absent (white) but ... myth that all persons with albinism have "white hair and red eyes" is not true. Colorless iris in ... of St John the Divine, 1:14: *:"His head and hair were white like wool, as white as snow, and His ...

Disulfide bond

... 2 In rubber 3 In eukaryotes 4 In hair 5 External links In bacteria ... chromatin of many mammalian species. In hair hair is a biological polymer, with over 90% of its ...

Keratin

... resulting in a fairly rigid structure. Human hair is approximately 14% cysteine. There are two ... keratins or cytokeratins and the hard hair keratins . These can be divided into type I ... structures that grow from the skin. The nails and hair of human beings contain keratin. It can be ...

Skin

... which in sufficient density is called fur . The hair mainly serves to augment the insulation the skin ... of structures including blood vessels, nerves, hair follicles, smooth muscle , glands and ... present. Erector muscles, attached between the hair papilla and epidermis, can contract, resulting in ...

Stem cell

... to transform into liver , nerve , muscle , hair follicle and kidney cells. Adult stem cells ... form of blood transfusion. Baldness hair follicles also contain stem cells, and some ... and once again making healthy hair. hair Cloning Nears Reality as Baldness Cure (Web MD ...

Protein

... deficiency can lead to symptoms such as fatigue, insulin resistance, hair loss, loss of hair pigment (hair that should be black becomes reddish), loss of muscle mass ...

Thermoregulation

... trap warm air acting as excellent insulators (sometimes used by humans). hair in mammals also acts as a good insulator; mammalian skin is much thicker ... smooth muscles (arrector pili in mammals) which are attached to feather or hair shafts; this shivering thermogenesis distorts the surface of the skin as ...

Anatomy

... Scalp Skin Teeth Tongue Other anatomic terms (not classified): Artery Coelom Diaphragm Gastrointestinal tract hair Exoskeleton Lip Nerve Peritoneum Serous membrane Skeleton Skull Spinal cord Vein See also List of ...

Artificial life

... as the creators of movies attempt to find more realistic and inexpensive ways to animate natural forms such as plant life, animal movement, hair growth, and complicated organic textures. The Unit of Theoretical Behavioural Ecology at the Free University of Brussels applied the ...

Cytoskeleton

... intermediate filaments are: made of vimentins , being the common structural support of many cells. made of keratin , found in skin cells, hair and nails . Neurofilaments of neural cells. made of Lamin , giving structural support to the nuclear envelope. Microtubules Main ...

DNA

... can be described as combinations of these accidental "operations". DNA in crime Forensic scientists can use DNA located in blood, semen, or hair left at the scene of a crime to identify a possible suspect, a process called DNA profiling or genetic fingerprinting. In DNA profiling the ...

Homunculus

... However, after a short time, the homunculus would turn on its creator and run away. The recipe consisted of a bag of bones, sperm, skin fragments and hair from any animal you wanted it to be a hybrid of. This was to be laid in the ground surrounded by horse manure for forty days, at which point the ...

Human

... to culture and art . In every human culture, people adorn their bodies, with tattoos , cosmetics , clothing , and jewelry . Hairstyles and hair color also have important cultural implications. The perception of an individual as physically beautiful or ugly can have profound implications ...

Intermediate filament

... IFs. The many isoforms are divided in two groups: "soft" keratins ( cytokeratins ) in epithelial cells (image to right), and "hard" keratins ( hair keratins ) which make up hair, nails, horns and reptilian scales. Regardless of the group, keratin can be acidic or basic. Acidic and basic ...

Klinefelter's syndrome

... the syndrome is characterised by gynecomastia (enlarged breasts), a rounded body type with abnormal body proportions, sparse facial and body hair , small testes , and an inability to produce sperm . Most XXY males have some degree of language impairment as well. The syndrome is associated ...

Kwashiorkor

... or where famine has struck), the child may develop kwashiorkor. Symptoms of kwashiorkor include a swollen abdomen, reddish discoloration of the hair and depigmented skin. The child has a miserable appearance with a "bull-dog" facies. Generally, the disease can be treated by adding food energy ...

Pigment

... Unlike structural color, pigment color is the same for all viewing angles. Nearly all types of cells, such as skin , eyes , fur and hair contain pigment. Butterfly wings typically contain structural color, although many of them contain pigment as well. Creatures that have deficient ...

Red Queen

... race (from Richard Dawkins ) can be achieved by considering the contrast between two adaptations of the polar bear . This animal has a coat of hair which is thick to help the bear survive the cold of the arctic and white in order that the bear can stalk seals for food. For the first case the ...

Vestibular system

... on a viscous gel layer, and are heavier than their surroundings. Therefore they get displaced during linear acceleration, which in turn deflects the hair cells (Fig. 4, bottom layer) and thus produces a sensory signal. Most of the utricular signals elicit eye movements, while the majority of the ...
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