definition of tubules
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T-tubule Transverse tubules are extensions of the cell membrane that penetrate into the centre of skeletal and cardiac muscle cells. With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell, and also play an important role in regulating cellular calcium concentration. Through these mechanisms, T-tubules allow heart muscle cells to contract more forcefully by synchronising calcium release throughout
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- adj. tub·bi·er, tub·bi·est. 1. Having a rounded shape: a tubby fishing boat. 2.
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Anatomy of the Urinary System The kidneys remove urea from the blood through tiny filtering units called nephrons. Each nephron consists of a ball formed of small blood capillaries, called a glomerulus, and a small tube called a renal tubule. Urea, together with water and other waste substances, forms the urine as it passes through the nephrons and down the renal tubules of the kidney. Two ureters. These narrow tubes carry urine from the kidneys to the bladder.
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nephron nephron. the structural and functional unit of the kidney, each nephron being capable of forming urine by itself. The nephron consists of the renal corpuscle, the proximal convoluted tubule, the descending and ascending limbs of the loop of Henle, the distal convoluted tubule, and the collecting tubule.Each kidney is an aggregation of about a million nephrons.he renal corpuscles and the convoluted parts of the renal tubules are located in the cortex of the kidney. The loops of Henle and collecting tubules are located in the medulla. Urine is formed in the renal corpuscles and renal tubules by filtration, reabsorption, and secretion.
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- A T-tubule (or transverse tubule) is a deep invagination of the sarcolemma, which is the plasma membrane of skeletal muscle and cardiac muscle cells.These invaginations allow depolarization of the membrane to quickly penetrate to the interior of the cell.ransverse tubules are invaginations of the sarcolemma. Though the invaginations are normally perpendicular to the length of the fiber, many T-tubules can lie axial to the long-axis of the fiber, both wrapping around and running alongside myofilament bundles.
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transverse transverse tubules. structures in myofibers which run transversely to the long axis of the myofibrils in skeletal and cardiac muscle. They are filled with basal lamina material and are part of the communication system of muscle fibers and provide a means for the passage of action potentials into the depths of the fibers.
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joule Medical Definition of joule. : a unit of work or energy equal to the work done by a force of one newton acting through a distance of one meter.
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- The seminiferous tubules are the site of the germination, maturation, and transportation of the sperm cells within the male testes.Seminiferous tubules are made up of columnar Sertoli cells surrounded by spermatogenic cells on the epithelial interior and stem cells exteriorly.lick to read more below. The seminiferous tubules are the site of the germination, maturation, and transportation of the sperm cells within the male testes. Seminiferous tubules are made up of columnar Sertoli cells surrounded by spermatogenic cells on the epithelial interior and stem cells exteriorly.
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Pustules Pustules: Small elevated pus containing lesion of the skin. See detailed information below for a list of 52 causes of Pustules, Symptom Checker, including diseases and drug side effect causes. » Review Causes of Pustules: Causes | Symptom Checker ». Listed below are some combinations of symptoms associated with Pustules, as listed in our database. Visit the Symptom Checker, to add and remove symptoms and research your condition. Pustules: Symptom Checker.
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Malpighian Tubules Malpighian Tubules. excretory organs in the majority of arachnids, myriopods, and insects; they are blind tubular appendages of the intestine, on the boundary between the mesenteron (midgut) and proctodeum (hindgut).xcretory organs in the majority of arachnids, myriopods, and insects; they are blind tubular appendages of the intestine, on the boundary between the mesenteron (midgut) and proctodeum (hindgut).
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- Wikipedia. glomerulus ‎(plural glomeruli). ( 1 anatomy) A small intertwined group of capillaries within nephrons of the kidney that filter the blood to make urine. 2  Any of several other similar intertwined masses of things.ikipedia. glomerulus ‎(plural glomeruli). ( 1 anatomy) A small intertwined group of capillaries within nephrons of the kidney that filter the blood to make urine. 2  Any of several other similar intertwined masses of things.
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- Definition of PROXIMAL CONVOLUTED TUBULE. : the convoluted portion of the vertebrate nephron that lies between Bowman's capsule and the loop of Henle and functions especially in the resorption of sugar, sodium and chloride ions, and water from the glomerular filtrate —called also proximal tubule. ADVERTISEMENT.
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- 1. A small cluster or mass of blood vessels or nerve fibers. 2. A tuft of capillaries situated within a Bowman's capsule at the end of a renal tubule in the vertebrate kidney that filters waste products from the blood and thus initiates urine formation.
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- Revival of the Klan. Post–World War II Klan. A secret society dedicated to white supremacy in the United States, the Ku Klux Klan (KKK) has existed in various forms since it was first organized in Tennessee shortly after the end of the Civil War (1861-65).ost–World War II Klan. A secret society dedicated to white supremacy in the United States, the Ku Klux Klan (KKK) has existed in various forms since it was first organized in Tennessee shortly after the end of the Civil War (1861-65).
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- 1. nephron-any of the small tubules that are the excretory units of the vertebrate kidney. uriniferous tubule. tubule-a small tube. malpighian body, malpighian corpuscle, renal corpuscle-the capsule that contains Bowman's capsule and a glomerulus at the expanded end of a nephron.. nephron-any of the small tubules that are the excretory units of the vertebrate kidney. uriniferous tubule. tubule-a small tube. malpighian body, malpighian corpuscle, renal corpuscle-the capsule that contains Bowman's capsule and a glomerulus at the expanded end of a nephron.
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The Renal Tubule: Definition, Function & Terms Renal tubules are essential structures in the kidneys. This lesson explores the function of the renal tubule and its parts, including the proximal and distal convoluted tubules, the loop of Henle, and the collecting duct.Learn how these components work together to absorb materials and form urine.roximal Convoluted Tubule. The filtrate in the Bowman's space I just mentioned enters the first duct in the renal tubule. This duct is called the proximal convoluted tubule, which is a section of the renal tubule located in the kidney's cortex that is responsible for the reabsorption of the majority of ultrafiltrate.
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- (nĕf′rŏn). nephron. A. renal vein. B. renal artery. C. blood vessels. D. blood.E. Bowman's capsule. F. glomerulus. G. collecting duct. H. urine.ephron-any of the small tubules that are the excretory units of the vertebrate kidney. uriniferous tubule. tubule-a small tube. malpighian body, malpighian corpuscle, renal corpuscle-the capsule that contains Bowman's capsule and a glomerulus at the expanded end of a nephron.
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- By Debbie Hadley. Definition: Slender tubules attached to the insect's alimentary canal, at the point where the midgut and hindgut are joined. The Malpighian tubules function as an excretory system and aid in osmoregulation.The tubules empty into the alimentary canal, and remove nitrogenous wastes from the insect's body.These structures were named for an Italian anatomist named Marcello Malpighi, who discovered the tubules in the seventeenth century.he Malpighian tubules function as an excretory system and aid in osmoregulation. The tubules empty into the alimentary canal, and remove nitrogenous wastes from the insect's body. These structures were named for an Italian anatomist named Marcello Malpighi, who discovered the tubules in the seventeenth century.
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pustule Medical Definition of pustule. 1  1: a small circumscribed elevation of the skin containing pus and having an inflamed base. 2  2: a small often distinctively colored elevation or spot resembling a blister or pimple.
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Medical Definition of Nephrosis home / medterms medical dictionary a-z list / nephrosis definition Medical Definition of Nephrosis Nephrosis: Any degenerative disease of the kidney tubules, the tiny canals that make up much of the substance of the kidney. Nephrosis can be caused by kidney disease, or it may be a complication of another disorder, particularly diabetes. Diagnosis is made via urine testing for the presence of protein, blood testing for lower-than-normal levels of protein, and observation of edema.
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fistula noun, plural fistulas, fistulae. [fis-choo-lee] /ˈfɪs tʃʊˌli/ (Show IPA) 1. Pathology. a narrow passage or duct formed by disease or injury, as one leading from an abscess to a free surface, or from one cavity to another. 2. Surgery. an opening made into a hollow organ, as the bladder or eyeball, for drainage. 3. Veterinary Pathology. any of various suppurative inflammations, as in the withers of a horse (fistulous withers) characterized by the formation of passages or sinuses through the tissues and to the surface of the skin.
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- Medical Definition of vesicular. 1  1: characterized by the presence or formation of vesicles a vesicular rash. 2  2: having the form of a vesicle a vesicular lesion.
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- Definition of MALPIGHIAN TUBULE. : any of a group of long blind vessels opening into the posterior part of the alimentary canal in most insects and some other arthropods and functioning primarily as excretory organs —called also Malpighian tube.See Malpighian tubule defined for kids.ADVERTISEMENT. any of a group of long blind vessels opening into the posterior part of the alimentary canal in most insects and some other arthropods and functioning primarily as excretory organs —called also Malpighian tube.
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Physiology of the Kidneys A system of the kidneys that consists of a series of tubules and ducts, connecting the nephrons to the ureter. The inside space of a tubular structure, such as an artery or intestine. Tiny blood vessels that travel alongside nephrons, allowing reabsorption and secretion between blood and the inner lumen of the nephron.
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- The seminiferous tubules are the site of the germination, maturation, and transportation of the sperm cells within the male testes. Seminiferous tubules are made up of columnar Sertoli cells surrounded by spermatogenic cells on the epithelial interior and stem cells exteriorly.
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nodule Definition of nodule for English Language Learners. : a small lump on a part of the body or on the root of a plant.