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Physiology

A Wisdom Archive on Physiology

Physiology

A selection of articles related to Physiology

We recommend this article: Physiology - 1, and also this: Physiology - 2.
physiology, Physiology, Physiology - Areas of physiology, Physiology - History, Physiology - Human and animal, Physiology - Plant

ARTICLES RELATED TO Physiology

Physiology: Encyclopedia II - Thyroid - Physiology

The primary function of the thyroid is production of the hormones thyroxine (T4), triiodothyronine (T3), and calcitonin. Up to 40% of the T4 is converted to T3 by peripheral organs such as the liver and spleen. Thyroid - T3 and T4 production and action. Thyroxine is synthetised by the follicular cells from the tyrosine residues of the protein called thyroglobulin (TG). Iodine, captured with the "iodine trap" is activated by the enzyme thyroid peroxidase (TPO) and linked to the 3' and 5' sites of the benzen ...

See also:

Thyroid, Thyroid - Anatomy, Thyroid - Gross anatomy, Thyroid - Blood supply, Thyroid - Histology of the thyroid, Thyroid - Physiology, Thyroid - T3 and T4 production and action, Thyroid - T3 and T4 regulation, Thyroid - Calcitonin, Thyroid - The significance of iodine, Thyroid - Diseases of the thyroid gland, Thyroid - Diagnosis, Thyroid - Treatment, Thyroid - Medical treatment, Thyroid - Thyroid surgery, Thyroid - History, Thyroid - External link

Read more here: » Thyroid: Encyclopedia II - Thyroid - Physiology

Physiology: Encyclopedia II - Optic nerve - Physiology

The optic nerve contains 1.2 million nerve fibers. This number is low compared to the roughly 130 million receptors in the retina, and implies that substantial pre-processing takes place in the retina before the signals are sent to the brain through the optic nerve. The blind spot of the eye is produced by the absence of retina where the optic nerve leaves the eye. This is because there are no photoreceptors in this area. ...

See also:

Optic nerve, Optic nerve - Anatomy, Optic nerve - Physiology, Optic nerve - Role in disease

Read more here: » Optic nerve: Encyclopedia II - Optic nerve - Physiology

Physiology: Encyclopedia II - Factor VIII - Physiology

FVIII is a glycoprotein procofactor synthesized and released into the bloodstream by the liver. In the circulating blood, it is mainly bound to von Willebrand factor (vWF, also known as Factor VIII-related antigen) to form a stable complex. Upon activation by thrombin or factor Xa, it dissociates from the complex to interact with Factor IXa the coagulation cascade. It is a cofactor to Factor IXa in the activation of Factor X, which in turn, with its cofactor Factor Va, activates more thrombin. Thrombin cleaves fibrinogen into fibrin which polymerizes and crossli ...

See also:

Factor VIII, Factor VIII - Genetics, Factor VIII - Physiology, Factor VIII - Therapeutic use

Read more here: » Factor VIII: Encyclopedia II - Factor VIII - Physiology

Physiology: Encyclopedia II - Adipose tissue - Physiology

Free fatty acid is "liberated" from lipoproteins by lipoprotein lipase (LPL) and enters the adipocyte, where it is reassembled into triglycerides by esterising it onto glycerol. Fat cells have an important physiological role in maintaining triglyceride and free fatty acid levels, as well as determining insulin resistance. Abdominal fat has a different metabolic profile—being more prone to induce insulin resistance. This explains to a large degree why central obesity is a marker of impaired glucose tolerance and is an independent risk factor for cardiovascular disease (even in the ab ...

See also:

Adipose tissue, Adipose tissue - Anatomical features, Adipose tissue - Physiology, Adipose tissue - Cultural and social role

Read more here: » Adipose tissue: Encyclopedia II - Adipose tissue - Physiology

Physiology: Encyclopedia II - Kender - Physiology

Kender are small, 3 to 4 feet creatures with slanted features around their eyes and ears. Their ears are a mix of human and elf ears. Their eye colour ranges from green, blue and brown to any combination of those colours. Kenders grow wrinkles at a very young age, and these are seen as attractive by many kender (some kendermaids try to grow them through various methods, much like humans and other races try to remove them). Kender hair colour is usually brown or black, with occasional kenders bearing red/orange and blonde hair. Their h ...

See also:

Kender, Kender - Origin, Kender - Physiology, Kender - Life Cycle, Kender - Birth, Kender - Young Childhood, Kender - Childhood, Kender - Teenage Years, Kender - Adulthood, Kender - Settling Down, Kender - Death, Kender - Traits, Kender - Handling, Kender - Kender Taunts, Kender - Kender Fearlessness, Kender - Weapons, Kender - Hoopak, Kender - Chapak, Kender - Famous Kender, Kender - Subraces of Kender

Read more here: » Kender: Encyclopedia II - Kender - Physiology

Physiology: Encyclopedia II - Tundra Wolf - Physiology

Tundra Wolf - Size. Artic wolves tend to have a mass of about 45-57 kg. Tundra Wolf - Colouration. Tundra Wolves that live in northern regions tend to have a very pale white colour, while more southerly wolves maybe be a dark gray or even black. ...

See also:

Tundra Wolf, Tundra Wolf - Physiology, Tundra Wolf - Size, Tundra Wolf - Colouration, Tundra Wolf - Range

Read more here: » Tundra Wolf: Encyclopedia II - Tundra Wolf - Physiology

Physiology: Encyclopedia II - Cerebrospinal fluid - Physiology

Cerebrospinal fluid also occupies the ventricular system of the brain and the spinal cord. It is mainly produced by the choroid plexus, but also by the ependymal lining of the brain's ventricles. The CSF is formed by the choroid plexus of the ventricles circulates through the interventricular foramina into the third ventricle and then via the mesencephalic duct (cerebral aqueduct) into the fourth ventricle space through two lateral apertures and one median aperature and is then absorbed by the venous system to the blood circulation. The total amount of cerebrospinal fluid is about 150 ml, and about 500 ml is produced every ...

See also:

Cerebrospinal fluid, Cerebrospinal fluid - Physiology, Cerebrospinal fluid - Pathology, Cerebrospinal fluid - Diagnosis and therapy

Read more here: » Cerebrospinal fluid: Encyclopedia II - Cerebrospinal fluid - Physiology

Physiology: Encyclopedia II - Protoss - Physiology

Protoss are about 3 meters tall and have two glowing eyes, digitigrade legs, semi-permeable skin covered in scales, four digits on their hands (of which two are thumbs) and toes, broad chests and shoulders, and narrow waists with slim midsections. Extending back from the crown of the head, Protoss have a bony crest. Beneath it, emerging from the back of the head, are the nerve cords, allowing them to access their racial psionic gestalt. T ...

See also:

Protoss, Protoss - History, Protoss - The Aeon of Strife, Protoss - He Who Brings Order, Protoss - Rogues, Protoss - Expansion and Discovery, Protoss - The Fall of Aiur, Protoss - Survival, Protoss - Physiology, Protoss - Protoss religion, Protoss - Religious principles, Protoss - Religious figures in Protoss society, Protoss - Heroes and other notable Protoss, Protoss - Gameplay attributes, Protoss - Units, Protoss - Land units, Protoss - Air units, Protoss - Buildings, Protoss - Basic buildings, Protoss - Advanced buildings, Protoss - Strategy, Protoss - Opening Strategies, Protoss - Second Round / Post-Opening Strategies, Protoss - Mid-Game Strategies, Protoss - Defense Strategies

Read more here: » Protoss: Encyclopedia II - Protoss - Physiology

Physiology: Encyclopedia II - Gastric acid - Physiology

Gastric acid is produced by parietal cells (also known as oxyntic cells) in the stomach. Its secretion is a complex and energetically expensive process. Parietal cells contain an extensive secretory network (called canaliculi) from which the gastric acid is secreted into the lumen of the stomach. These cells are part of epithelial fundic glands in the gastric mucosa. The pH of gastric acid is 2-3 in the stomach lumen, the acidity being maintained by the proton pump, a H+/K+ ATPase. The parietal cell releases bicarbonate into the blood stream in the process, which causes the temporary rise ...

See also:

Gastric acid, Gastric acid - Physiology, Gastric acid - Regulation of secretion, Gastric acid - Role in disease, Gastric acid - Pharmacology

Read more here: » Gastric acid: Encyclopedia II - Gastric acid - Physiology

Physiology: Encyclopedia II - Vitamin K - Physiology

Vitamin K is involved in the carboxylation of certain glutamate residues in proteins to form gamma-carboxyglutamate residues (abbreviated Gla-residues). Gla-residues are usually involved in binding calcium. The Gla-residues are essential for the biological activity of all known Gla-proteins. At this time fewer than 12 human Gla-proteins have been discovered, and they play key roles in the regulation of three physiological processes: blood coagulation (prothrombin (factor II), factors VII, IX, X, protein C, protein S and protein Z) bone meta ...

See also:

Vitamin K, Vitamin K - Chemical structure, Vitamin K - Physiology, Vitamin K - Role in disease, Vitamin K - History, Vitamin K - Discovery, Vitamin K - Gla-proteins

Read more here: » Vitamin K: Encyclopedia II - Vitamin K - Physiology

Physiology: Encyclopedia II - Pit viper - Physiology

The titular pits are between the nostril and the eye on either side of the Pit Viper's head. They contain membranes sensitive to infrared radiation; this allows the snakes to detect prey whose body temperatures are higher or lower than the surrounding environment, namely small rodents, birds and lizards. The temperature difference need not be great; fractions of a degree are enough. This adaptation serves the vipers well, as they are nocturnal animals and rely heavily on this "sixth sense". This adaptation is observed in o ...

See also:

Pit viper, Pit viper - Physiology, Pit viper - Habitat and behavior, Pit viper - Reproduction, Pit viper - Genera

Read more here: » Pit viper: Encyclopedia II - Pit viper - Physiology

Physiology: Encyclopedia II - Factor VII - Physiology

The main role of factor VII (FVII) is to initiate the process of coagulation in conjunction with tissue factor (TF). Tissue factor is found on the outside of blood vessels - normally not exposed to the bloodstream. Upon vessel injury, tissue factor is exposed to the blood and circulating factor VII. Once bound to TF, FVII is activated to FVIIa by different proteases, among which are thrombin (factor IIa), activated factor X and the FVIIa-TF complex itself. The most important substrates ...

See also:

Factor VII, Factor VII - Physiology, Factor VII - Genetics, Factor VII - Role in disease, Factor VII - Therapeutic use, Factor VII - Reference

Read more here: » Factor VII: Encyclopedia II - Factor VII - Physiology

Physiology: Encyclopedia II - Factor X - Physiology

Factor X is synthesized in the liver and requires vitamin K for its synthesis. Factor X is activated into factor Xa by both factor IX (with its cofactor, factor VIII in a complex known as intrinsic Xase) and factor VII with its cofactor, tissue factor (a complex known as extrinsic Xase). It is therefore the first member of the final common pathway or thrombin pathway. It acts by cleaving prothrombin in two places (an arg-thr and then an arg-ile bond), which yields the active thrombin. This p ...

See also:

Factor X, Factor X - Physiology, Factor X - Genetics, Factor X - Role in disease, Factor X - Therapeutic use, Factor X - History

Read more here: » Factor X: Encyclopedia II - Factor X - Physiology

Physiology: Encyclopedia II - Immunoglobulin E - Physiology

IgE's role in allergy is presumably innapropriate - why would a systemic anaphylactic reaction to a harmless substance be biologically useful? There is much speculation into what positive aspects IgE has, and so far circumstantial evidence in animal models and statistical population trends have hinted that IgE may be beneficial in fighting gut parasites such as Schistosoma mansoni, but this has not been conclusively proven in humans. Although it is not yet well understood, IgE may play an important role in the immune system's recognit ...

See also:

Immunoglobulin E, Immunoglobulin E - Physiology, Immunoglobulin E - Role in disease, Immunoglobulin E - Pharmacology, Immunoglobulin E - Allergy misconceptions

Read more here: » Immunoglobulin E: Encyclopedia II - Immunoglobulin E - Physiology

Physiology: Encyclopedia II - Factor V - Physiology

Factor V is bound to platelets and is activated by thrombin. On activation, factor V is spliced in two chains (heavy and light chain) which are nonconvalently bound to each other by calcium. Factor Va, the activated form, is a cofactor for factor X in its reciprocal activation of prothrombin (factor II) into thrombin. Factor Va is degraded by activated protein C, one of the principal p ...

See also:

Factor V, Factor V - Genetics, Factor V - Physiology, Factor V - Role in disease, Factor V - History, Factor V - Reference, Factor V - External link

Read more here: » Factor V: Encyclopedia II - Factor V - Physiology

Physiology: Encyclopedia II - Urinary system - Physiology

Urinary system - Kidneys. The kidney is one of the various organs (together with the lungs, intestine and skin) that participates in the elimination of the wastes of the organism. The kidneys are bean-shaped organs about the size of a human fist. They are near the middle of the spine, just below the ribcage. A kidney consists of about 1 million filtering units termed nephrons, each consisting of a glomerulus, ball-shaped network of capillaries, and a network of tubules. Blood is filtered by the glomerulus, and the resultant "prourine" passes through the tubular system where wate ...

See also:

Urinary system, Urinary system - Physiology, Urinary system - Kidneys, Urinary system - Ureters, Urinary system - Bladder, Urinary system - Role in disease, Urinary system - Testing

Read more here: » Urinary system: Encyclopedia II - Urinary system - Physiology

Physiology: Encyclopedia II - Blood vessel - Physiology

Blood vessels do not actively engage in the transport of the blood (they have no appreciable peristalsis), but arteries - and veins to a degree - can regulate their caliber by contraction of the muscular layer. This determines the blood flow to particular downstream organs, and is determined by the autonomic nervous system. Vasodilation and vasoconstriction are also used antagonistically as a method of thermoregulation in homeotherms. Oxygen (bound to hemoglobin in red blood cells) is the most critical nutrient carried by the blood. I ...

See also:

Blood vessel, Blood vessel - Types, Blood vessel - Anatomy, Blood vessel - Physiology, Blood vessel - Role in disease

Read more here: » Blood vessel: Encyclopedia II - Blood vessel - Physiology

Physiology: Encyclopedia II - Mast cell - Physiology

Mast cells express a high-affinity receptor (FcεRI) for Immunoglobulin E (IgE), the least abundant member of the antibodies. This receptor is of such high affinity that binding of IgE molecules is essentially irreversible. As a result, mast cells are coated with IgE. IgE is, in turn, synthetised by B-cells (the antibody-producing cells of the immune system). IgE molecules, like all antibodies, are specific for one specific epitope. In allergic reactions, mast cells remain inactive until an allergen binds to IgE already in association ...

See also:

Mast cell, Mast cell - Origin and classification, Mast cell - Physiology, Mast cell - Role in disease, Mast cell - Allergic disease, Mast cell - Anaphylaxis, Mast cell - Mast cell disorders, Mast cell - Sources

Read more here: » Mast cell: Encyclopedia II - Mast cell - Physiology

Physiology: Encyclopedia II - Bovine somatotropin - Physiology

Because of protein homology, bovine growth hormone (GH) cross-reacts with the receptors of prolactin and placental lactogen — two hormones that stimulate mammary tissue to produce more milk. Somatotropin and somatropin both refer to growth hormone (GH), a protein hormone produced by the mammalian pituitary. The genes for GH, the amino acid sequence of the peptides, the receptor genes, and the receptor structures are recognizably homologous, though cross-species differences are significant enough to prevent most cross-spe ...

See also:

Bovine somatotropin, Bovine somatotropin - Physiology, Bovine somatotropin - Recombinant Bovine Somatotropin rbST and rBGH, Bovine somatotropin - Politics, Bovine somatotropin - External references

Read more here: » Bovine somatotropin: Encyclopedia II - Bovine somatotropin - Physiology

Physiology: Encyclopedia II - Turkana Boy - Physiology

The skeleton was about 1.60m (5 ft 3 in.) tall; though he might have been 68 kg (150 pounds) and 1.85m (6 ft 1 in) tall had he lived to adulthood. The cranial capacity of Turkana Boy was about 880cc, although if he had lived to adulthood it would have been about 910cc, which is considerably smaller than the 1350cc cranial capacity of modern humans. There are several features which seem awkward in comparison to modern humans. The pelvis structure is narrower than in modern Homo sapiens meaning that Homo ergaster and Ho ...

See also:

Turkana Boy, Turkana Boy - Adolescence & Maturity, Turkana Boy - Physiology, Turkana Boy - Social behavior & language, Turkana Boy - Reference, Turkana Boy - Footnote, Turkana Boy - External link

Read more here: » Turkana Boy: Encyclopedia II - Turkana Boy - Physiology

Physiology: Encyclopedia II - Superoxide dismutase - Physiology

The superoxide anion radical (O2-) spontaneously dismutes to O2 and H2O2 quite rapidly. However, SOD has the fastest turnover number (reaction rate with its substrate) of any known enzyme. In fact, its rate is diffusion-limited. Thus, under real-world intracellular conditions, SOD greatly reduces the ambient level of the dangerous superoxide radical. The presence of SOD has been shown to help protect many types of cells from the free radical damage that is important in aging, sene ...

See also:

Superoxide dismutase, Superoxide dismutase - Reaction, Superoxide dismutase - Types, Superoxide dismutase - General, Superoxide dismutase - Human, Superoxide dismutase - Physiology, Superoxide dismutase - Role in disease, Superoxide dismutase - Cosmetic uses

Read more here: » Superoxide dismutase: Encyclopedia II - Superoxide dismutase - Physiology

Physiology: Encyclopedia II - Endocrine system - Physiology

The endocrine system links the brain to the organs that control body metabolism, growth and development, and reproduction. Signal transduction of some hormones with steroid structure involves nuclear hormone receptor proteins that are a class of ligand activated proteins that, when bound to specific sequences of DNA serve as on-off switches for transcription within the cell nucleus. These switches control the development and differentiation of skin, bone and behavioral centers in the brain, as well as th ...

See also:

Endocrine system, Endocrine system - Physiology, Endocrine system - Table of endocrine glands and the hormones secreted, Endocrine system - In both sexes:, Endocrine system - In males only, Endocrine system - In females only, Endocrine system - Role in disease

Read more here: » Endocrine system: Encyclopedia II - Endocrine system - Physiology




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