renal tubule

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tubule

 [too´būl]
a small tube; especially, a minute canal found in various structures or organs of the body. adj., adj tu´bular.
collecting t's the terminal channels of the nephrons, which open on the summits of the renal pyramids in the renal papillae.
convoluted t's channels that follow a tortuous course; there are convoluted renal tubules and convoluted seminiferous tubules.
dentinal t's the tubular structures of the teeth.
galactophorous t's small channels for the passage of milk from the secreting cells in the mammary gland.
Henle's t's the straight ascending and descending portions of a renal tubule forming Henle's loop.
lactiferous t's galactophorous tubules.
mesonephric t's the tubules comprising the mesonephros, or temporary kidney, of amniotes.
metanephric t's the tubules comprising the permanent kidney of amniotes.
renal tubule the minute canals composing the substance of the kidney and secreting, collecting and conducting the urine; in the glomerulus they have a basement membrane and epithelial lining.
seminiferous t's the tubules of the testis, in which spermatozoa develop and through which they leave the gland.
uriniferous t's renal tubules; channels for the passage of urine.

renal tubule

Etymology: L, ren, kidney, tubulus, small tube
the part of the kidney's nephron that leads from the glomerulus to the collecting tubules. It consists of a looping segment and two convoluted sections. These canals resorb selected materials back into the blood and secrete, collect, and conduct urine.

renal tubule

The part of a nephron through which renal filtrate from the renal corpuscle flows and is changed to urine by reabsorption and secretion. The parts, in order, are the proximal convoluted tubule, the loop of Henle, the distal convoluted tubule, and collecting tubule.
See: kidney for illus; nephron
See also: tubule
References in periodicals archive ?
The measurement of proximal convoluted renal tubules showed that the diameter of tubules did not differ from those of the control group.
About 99 per cent of substances filtered at the glomerulus are reabsorbed along the renal tubules.
It is the most serious complication of rhabdomyolysis and results from heme protein nephrotoxicity, myoglobin cast formation within the renal tubules and renal vasoconstriction.
The renal tubule is a system of tiny kidney canals in which urine is formed and through which urine passes.
In lab experiments, Piermarini, Beyenbach and their team demonstrated that blocking the protein's function in the renal tubules with a drug reverses the enhanced rates of urination that would occur during blood feeding.
For kidneys we analysed the structure of Bowman capsules, glomerular capillaries, intra-capsular spaces, renal tubules, as well as the presence of leukocytes, red cells and edema formation.
11[beta]-HSD2 is normally abundant in renal tubules and selectively converts cortisol to cortisone.
As the concentration of fenitrothion increased, there was more degeneration of cells of renal tubules as shown in the kidney of rats exposed to 100 mg/kg fenitrothion.
Clearance of digoxin is also affected by p-glycoprotein, a transporter protein located in renal tubules and intestinal epithelial cells.
In addition, oxalate precipitation in the lumen of the renal tubules was associated with glomerular lesions.
Isler, first-trimester exposure to these drugs is unlikely to cause fetal harm, because the fetal renal tubules are inactive before 8 weeks' gestation.
The most significant findings were dilation of renal tubules, protein casts, expansion of the mesangial matrix material in the glomerulus, and focal segmental glomerulosclerosis in the rats treated with puromycin (20 mg/kg/day) for 21 days.

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