Biology Questions and Answers
absent in the urine (the few filtered
proteins may nephron tubules). also be resorbed in theProteinuria is an
indication that a more than expected
amount of proteins is pglomerulus suggesting glassing thomerulare (^)
disease, e.g., in diabetic nephropathy.
The glomerulus also blocks the passageof blood cells and platelets (hematuria is (^)
often a sign less specific of kidneys since thof urinary disease althoughe blood
may come from the lower parts of the
excretory tract).
- Where does most of the
water resorbed after
glomerular filtration go? What
are the other substances
resorbed by the nephron
tubules?
Only 0.5 is eliminatto 1% of ed as urine. The remaininthe glomerular filtrateg
volume, coions, glucose, amino ntaining mainly metaacids and water, isbolic (^)
resorbed through the nephron tubules
(by means of transport) and gains the bloodactive or passive
circulation again.
The convolute tubules of the nephron
are responsiblsubstances. e for the resorption of
- Why do cells of the
nephron tubules present a
great amount of
mitochondria?
The cells of the tubule wall have high
number of mitochosubstances are resorbed or secretendria because manyd
through them by means of activetransport (a process that spendsenergy). Therefore many mitocho (^) ndria
are necessary for the energetic supply
(ATP supply) of this type of transport.
- What is tubular secretion?
What are some examples of
substances secreted through
the renal tubules?
Tubular secretion is the passage of
substancesthat surround the nephron tubules to from the blood capillaries (^)
the tubular lumen for these substances
to be excreted with uric acid, potassium, bicarurine. Ammobonate nia,and (^)
hydrogen ions, metabolic acids and
bases, various in(medicines) and other substancesgested drugs (^) are
secreted by the nephron tubules.
- In which nephron portion
does the regulation of acidity
and alkalinity of the plasma
occur?
The regulation oequilibrium of the body is done by thef the acid-basic (^)
kidneys aresorption nd depends upon the tubularand secretion.
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